without bodily substance, _i.e._ a body without body; (β) that there are no atoms (no indivisible independent existence), for the same reason, viz., because the essence of body is extension. (γ) He further shows that a body is set in motion by something outside of it, but of itself it continues in a condition of rest, and likewise it must, when in a condition of movement, be brought to rest by another outside of it—this is the property of inertia.[186] These are unmeaning propositions, for an abstraction is involved for instance in asserting simple rest and movement in their opposition.
Extension and motion are the fundamental conceptions in mechanical physics; they represent the truth of the corporeal world. It is thus that ideality comes before the mind of Descartes, and he is far elevated above the reality of the sensuous qualities, although he does not reach so far as to the separation of this ideality. He thus remains at the point of view of mechanism pure and simple. Give me matter (extension) and motion and I will build worlds for you, is what Descartes virtually says.[187] Space and time were hence to him the only determinations of the material universe. In this, then, lies the mechanical fashion of viewing nature, or the natural philosophy of Descartes is seen to be purely mechanical.[188] Hence changes in matter are due merely to motion, so that Descartes traces every relationship to the rest and movement of particles, and all material diversity such as colour, and taste—in short, all bodily qualities and animal phenomena—to mechanism. In living beings processes such as that of digestion are mechanical effects which have as principles, rest and movement. We here see the ground and origin of the mechanical philosophy; but further on we find that this is unsatisfactory, for matter and motion do not suffice to explain life.
Yet the great matter in all this is that thought goes forward in its determinations, and that it constitutes from these thought-determinations the truth of nature.
In his consideration of the system of the world and the movement of the heavenly bodies, Descartes has worked out the mechanical view more fully.
He thus comes to speak of the earth, the sun, &c., and of his conception of the circling motion of the heavenly bodies in the form of vortices: of metaphysical hypotheses as to how small particles pass into, out of, and through pores and act on one another; and finally to saltpetre and gunpowder.[189] Universal reflections should have the first claim on our attention; but on the other hand the transition to the determinate is accomplished in a system of Physics which is the result of observations and experiences, and this is done entirely by means of the understanding. Descartes thus mingles many observations with a metaphysic of this nature, and to us the result is hence obscure. In this philosophy the thinking treatment of empiricism is thus predominant, and a similar method has been adopted by philosophers from this time on. To Descartes and others, Philosophy had still the more indefinite significance of arriving at knowledge through thought, reflection, and reasoning. Speculative cognition, the derivation from the Notion, the free independent development of the matter itself, was first introduced by Fichte, and consequently what is now called philosophic knowledge is not yet separated in Descartes from the rest of scientific knowledge. In those times all the knowledge of mankind was called philosophy; in Descartes’ metaphysics we thus saw quite empirical reflection and reasoning from particular grounds, from experiences, facts, phenomena, being brought into play in the naivest manner, and one has no sense of speculation in the matter. The strictly scientific element here really consisted mainly in the method of proof as it has long been made use of in geometry, and in the ordinary method of the formal logical syllogism. Hence it likewise happens that Philosophy, which ought to form a totality of the sciences, begins with logic and metaphysics; the second part is composed of ordinary physics and mathematics, mingled no doubt with metaphysical speculations, and the third part, ethics, deals with the nature of man, his duties, the state, the citizen. And this is the case with Descartes. The first part of the _Principia philosophiæ_ treats _De principiis cognitionis humanæ_, the second _De principiis rerum materialium_. This natural philosophy, as a philosophy of extension, is, however, none other than what a quite ordinary physics or mechanics might at that time be, and it is still quite hypothetical; we, on the other hand, accurately distinguish empirical physics and natural philosophy, even though the first likewise pertains to thought.
3. Descartes never reached the third part, the philosophy of Mind, for, while he made a special study of physics, in the region of ethics he published one tract only, _De passionibus_. In this reference Descartes treats of thought and human freedom. He proves freedom from the fact of the soul thinking that the will is unrestrained, and of that constituting the perfection of mankind. And this is quite true. In respect to the freedom of the will he comes across the difficulty of how to reconcile it with the divine prescience. As free, man might do what is not ordained of God beforehand—this would conflict with the omnipotence and omniscience of God; and if everything is ordained of God, human freedom would thereby be done away with. Yet he does not solve the contradiction contained in these two different aspects without falling into difficulty. But conformably to the method which he adopts, and which we pointed out above (pp. 238, 239), he says: “The human mind is finite, God’s power and predetermination are infinite; we are thus not capable of judging of the relationship in which the freedom of the human soul stands to the omnipotence and omniscience of God—but in self-consciousness we have the certainty of it given us as a fact. And we must hold only to what is certain.”[190] When he proceeds further much appears to him still incapable of explanation; but we see obstinacy and caprice likewise exhibited in his stopping short at the assertion as to the best of his knowledge. The method of knowledge as set forth by Descartes, takes the form of a reasoning of the understanding, and is thus without special interest.
These, then, are the principal points in the Cartesian system. Some particular assertions made by Descartes, which have been specially instrumental in giving him fame, have still to be mentioned—particular forms which have been formerly considered in metaphysics, and likewise by Wolff. For example, in the first place we gather that Descartes regarded animals and other organisms as machines moved by another, and not possessing the principle of the spontaneity of thought within them[191]—a mechanical physiology, a cut and dry thought pertaining to the understanding, which is of no further importance. In the sharp opposition between thought and extension, the former is not considered as sensation, so that the latter can isolate itself. The organic must as body reduce itself to extension; any further development of this last thus only proves its dependence on the first determinations.
In the second place, the relation between soul and body now becomes an important question, that is, the return of the object within itself in such a way that thought posits itself in another, in matter. As to this, many systems are offered to us in metaphysics. One of these is the _influxus physicus_, that the relation of spirit is of a corporeal nature, that the object is related to mind as bodies are to one another—a conception like this is very crude. How does Descartes understand the unity of soul and body? The former belongs to thought, the latter to extension; and thus because both are substance, neither requires the Notion of the other, and hence soul and body are independent of one another and can exercise no direct influence upon one another.
Soul could only influence body in so far as it required the same, and conversely—that is, in so far as they have actual relation to one another. But since each is a totality, neither can bear a real relation to the other. Descartes consistently denied the physical influence of one on the other; that would have signified a mechanical relation between the two. Descartes thus established the intellectual sphere in contradistinction to matter, and on it based the independent subsistence of mind; for in his _cogito_ ‘I’ is at first only certain of itself, since I can abstract from all. Now we find the necessity of a mediator to bring about a union of the abstract and the external and individual.
Descartes settles this by placing between the two what constitutes the metaphysical ground of their mutual changes, God. He is the intermediate bond of union, in as far as He affords assistance to the soul in what it cannot through its own freedom accomplish, so that the changes in body and soul may correspond with one another.[192] If I have desires, an intention, these receive corporeal realization; this association of soul and body is, according to Descartes, effected through God. For above (p. 239) we saw that Descartes says of God that He is the Truth of the conception: as long as I think rightly and consistently, something real corresponds to my thought, and the connecting link is God. God is hereby the perfect identity of the two opposites, since He is, as Idea, the unity of Notion and reality. In the Idea of Spinoza this is worked out and developed in its further moments. Descartes’ conclusion is quite correct; in finite things this identity is imperfect. Only the form employed by Descartes is inadequate; for it implies that in the beginning there are two things, thought or soul and body, and that then God appears as a third thing, outside both—that He is not the Notion of unity, nor are the two elements themselves Notion. We must not however forget that Descartes says that both those original elements are created substances. But this expression ‘created’ pertains to the ordinary conception only and is not a determinate thought; it was Spinoza, therefore, who first accomplished this return to thought.
2. SPINOZA.
The philosophy of Descartes underwent a great variety of unspeculative developments, but in Benedict Spinoza a direct successor to this philosopher may be found, and one who carried on the Cartesian principle to its furthest logical conclusions. For him soul and body, thought and Being, cease to have separate independent existence. The dualism of the Cartesian system Spinoza, as a Jew, altogether set aside. For the profound unity of his philosophy as it found expression in Europe, his manifestation of Spirit as the identity of the finite and the infinite in God, instead of God’s appearing related to these as a Third—all this is an echo from Eastern lands. The Oriental theory of absolute identity was brought by Spinoza much more directly into line, firstly with the current of European thought, and then with the European and Cartesian philosophy, in which it soon found a place.
First of all we must, however, glance at the circumstances of Spinoza’s life. He was by descent a Portuguese Jew, and was born at Amsterdam in the year 1632; the name he received was Baruch, but he altered it to Benedict. In his youth he was instructed by the Rabbis of the synagogue to which he belonged, but he soon fell out with them, their wrath having been kindled by the criticisms which he passed on the fantastic doctrines of the Talmud. He was not, therefore, long in absenting himself from the synagogue, and as the Rabbis were in dread lest his example should have evil consequences, they offered him a yearly allowance of a thousand gulden if he would keep away from the place and hold his tongue. This offer he declined; and the Rabbis thereafter carried their persecution of him to such a pitch that they were even minded to rid themselves of him by assassination. After having made a narrow escape from the dagger, he formally withdrew from the Jewish communion, without, however, going over to the Christian Church. He now applied himself particularly to the Latin language, and made a special study of the Cartesian philosophy.
Later on he went to Rhynsburg, near Leyden, and from the year 1664 he lived in retirement, first at Voorburg, a village near the Hague, and then at the Hague itself, highly respected by numerous friends: he gained a livelihood for himself by grinding optical glasses. It was no arbitrary choice that led him to occupy himself with light, for it represents in the material sphere the absolute identity which forms the foundation of the Oriental view of things. Although he had rich friends and mighty protectors, among whom even generals were numbered, he lived in humble poverty, declining the handsome gifts offered to him time after time. Nor would he permit Simon von Vries to make him his heir; he only accepted from him an annual pension of three hundred florins; in the same way he gave up to his sisters his share of their father’s estate.
From the Elector Palatine, Carl Ludwig, a man of most noble character and raised above the prejudices of his time, he received the offer of a professor’s chair at Heidelberg, with the assurance that he would have liberty to teach and to write, because “the Prince believed he would not put that liberty to a bad use by interfering with the religion publicly established.” Spinoza (in his published letters) very wisely declined this offer, however, because “he did not know within what limits that philosophic liberty would have to be confined, in order that he might not appear to be interfering with the publicly established religion.”
He remained in Holland, a country highly interesting in the history of general culture, as it was the first in Europe to show the example of universal toleration, and afforded to many a place of refuge where they might enjoy liberty of thought; for fierce as was the rage of the theologians there against Bekker, for example (Bruck. Hist. crit. phil.
T. IV. P. 2, pp. 719, 720), and furious as were the attacks of Voetius on the Cartesian philosophy, these had not the consequences which they would have had in another land. Spinoza died on the 21st of February, 1677, in the forty-fourth year of his age. The cause of his death was consumption, from which he had long been a sufferer; this was in harmony with his system of philosophy, according to which all particularity and individuality pass away in the one substance. A Protestant divine, Colerus by name, who published a biography of Spinoza, inveighs strongly against him, it is true, but gives nevertheless a most minute and kindly description of his circumstances and surroundings—telling how he left only about two hundred thalers, what debts he had, and so on. A bill included in the inventory, in which the barber requests payment due him by M. Spinoza of blessed memory, scandalizes the parson very much, and regarding it he makes the observation: “Had the barber but known what sort of a creature Spinoza was, he certainly would not have spoken of his blessed memory.” The German translator of this biography writes under the portrait of Spinoza: _characterem, reprobationis in vultu gerens_, applying this description to a countenance which doubtless expresses the melancholy of a profound thinker, but is otherwise mild and benevolent.
The _reprobatio_ is certainly correct; but it is not a reprobation in the passive sense; it is an active disapprobation on Spinoza’s part of the opinions, errors and thoughtless passions of mankind.[193] Spinoza used the terminology of Descartes, and also published an account of his system. For we find the first of Spinoza’s works entitled “An Exposition according to the geometrical method of the principles of the Cartesian philosophy.” Some time after this he wrote his _Tractatus theologico-politicus_, and by it gained considerable reputation. Great as was the hatred which Spinoza roused amongst his Rabbis, it was more than equalled by the odium which he brought upon himself amongst Christian, and especially amongst Protestant theologians—chiefly through the medium of this essay. It contains his views on inspiration, a critical treatment of the books of Moses and the like, chiefly from the point of view that the laws therein contained are limited in their application to the Jews.
Later Christian theologians have written critically on this subject, usually making it their object to show that these books were compiled at a later time, and that they date in part from a period subsequent to the Babylonian captivity; this has become a crucial point with Protestant theologians, and one by which the modern school distinguishes itself from the older, greatly pluming itself thereon. All this, however, is already to be found in the above-mentioned work of Spinoza. But Spinoza drew the greatest odium upon himself by his philosophy proper, which we must now consider as it is given to us in his Ethics. While Descartes published no writings on this subject, the Ethics of Spinoza is undoubtedly his greatest work; it was published after his death by Ludwig Mayer, a physician, who had been Spinoza’s most intimate friend. It consists of five parts; the first deals with God (_De Deo_). General metaphysical ideas are contained in it, which include the knowledge of God and nature.
The second part deals with the nature and origin of mind (_De natura et origine mentis_). We see thus that Spinoza does not treat of the subject of natural philosophy, extension and motion at all, for he passes immediately from God to the philosophy of mind, to the ethical point of view; and what refers to knowledge, intelligent mind, is brought forward in the first part, under the head of the principles of human knowledge.
The third book of the Ethics deals with the origin and nature of the passions (_De origine et natura affectuum_); the fourth with the powers of the same, or human slavery (_De servitute humana seu de affectuum viribus_); the fifth, lastly, with the power of the understanding, with thought, or with human liberty (_De potentia intellectus seu de libertate humana_).[194] Kirchenrath Professor Paulus published Spinoza’s works in Jena; I had a share in the bringing out of this edition, having been entrusted with the collation of French translations.
As regards the philosophy of Spinoza, it is very simple, and on the whole easy to comprehend; the difficulty which it presents is due partly to the limitations of the method in which Spinoza presents his thoughts, and partly to his narrow range of ideas, which causes him in an unsatisfactory way to pass over important points of view and cardinal questions. Spinoza’s system is that of Descartes made objective in the form of absolute truth. The simple thought of Spinoza’s idealism is this: The true is simply and solely the one substance, whose attributes are thought and extension or nature: and only this absolute unity is reality, it alone is God. It is, as with Descartes, the unity of thought and Being, or that which contains the Notion of its existence in itself. The Cartesian substance, as Idea, has certainly Being included in its Notion; but it is only Being as abstract, not as real Being or as extension (_supra_, p. 241). With Descartes corporeality and the thinking ‘I’ are altogether independent Beings; this independence of the two extremes is done away with in Spinozism by their becoming moments of the one absolute Being. This expression signifies that Being must be grasped as the unity of opposites; the chief consideration is not to let slip the opposition and set it aside, but to reconcile and resolve it. Since then it is thought and Being, and no longer the abstractions of the finite and infinite, or of limit and the unlimited, that form the opposition (_supra_, p. 161), Being is here more definitely regarded as extension; for in its abstraction it would be really only that return into itself, that simple equality with itself, which constitutes thought (_supra_, p.
229). The pure thought of Spinoza is therefore not the simple universal of Plato, for it has likewise come to know the absolute opposition of Notion and Being.
Taken as a whole, this constitutes the Idea of Spinoza, and it is just what τὸ ὄν was to the Eleatics (Vol. I. pp. 244, 252). This Idea of Spinoza’s we must allow to be in the main true and well-grounded; absolute substance is the truth, but it is not the whole truth; in order to be this it must also be thought of as in itself active and living, and by that very means it must determine itself as mind. But substance with Spinoza is only the universal and consequently the abstract determination of mind; it may undoubtedly be said that this thought is the foundation of all true views—not, however, as their absolutely fixed and permanent basis, but as the abstract unity which mind is in itself. It is therefore worthy of note that thought must begin by placing itself at the standpoint of Spinozism; to be a follower of Spinoza is the essential commencement of all Philosophy. For as we saw above (Vol I. p. 144), when man begins to philosophize, the soul must commence by bathing in this ether of the One Substance, in which all that man has held as true has disappeared; this negation of all that is particular, to which every philosopher must have come, is the liberation of the mind and its absolute foundation. The difference between our standpoint and that of the Eleatic philosophy is only this, that through the agency of Christianity concrete individuality is in the modern world present throughout in spirit. But in spite of the infinite demands on the part of the concrete, substance with Spinoza is not yet determined as in itself concrete. As the concrete is thus not present in the content of substance, it is therefore to be found within reflecting thought alone, and it is only from the endless oppositions of this last that the required unity emerges. Of substance as such there is nothing more to be said; all that we can do is to speak of the different ways in which Philosophy has dealt with it, and the opposites which in it are abrogated. The difference depends on the nature of the opposites which are held to be abrogated in substance. Spinoza is far from having proved this unity as convincingly as was done by the ancients; but what constitutes the grandeur of Spinoza’s manner of thought is that he is able to renounce all that is determinate and particular, and restrict himself to the One, giving heed to this alone.
1. Spinoza begins (Eth. P. I pp. 35, 36) with a series of definitions, from which we take the following.
a. Spinoza’s first definition is of the Cause of itself. He says: “By that which is _causa sui_, its own cause, I understand that whose essence” (or Notion) “involves existence, or which cannot be conceived except as existent.” The unity of existence and universal thought is asserted from the very first, and this unity will ever be the question at issue. “The cause of itself” is a noteworthy expression, for while we picture to ourselves that the effect stands in opposition to the cause, the cause of itself is the cause which, while it operates and separates an “other,” at the same time produces only itself, and in the production therefore does away with this distinction. The establishing of itself as an other is loss or degeneration, and at the same time the negation of this loss; this is a purely speculative Notion, indeed a fundamental Notion in all speculation. The cause in which the cause is identical with the effect, is the infinite cause (_infra_, p. 263); if Spinoza had further developed what lies in the _causa sui_, substance with him would not have been rigid and unworkable.
b. The second definition is that of the finite. “That thing is said to be finite in its kind which can be limited by another of the same nature,” For it comes then to an end, it is not there; what is there is something else. This something else must, however, be of a like nature; for those things which are to limit each other must, in order to be able to limit each other, touch each other, and consequently have a relation to each other, that is to say they must be of one nature, stand on a like basis, and have a common sphere. That is the affirmative side of the limit.
“Thus a thought is” only “limited by another thought, a body by another body, but thoughts are not limited by bodies nor” conversely “bodies by thoughts.” We saw this (p. 244) with Descartes: thought is an independent totality and so is extension, they have nothing to do with one another; they do not limit each other, each is included in itself.
c. The third definition is that of substance. “By substance I understand that which exists in itself and is conceived by itself, _i.e._ the conception of which does not require the aid of the conception of any other thing for its formation (_a quo formari debeat_);” otherwise it would be finite, accidental. What cannot have a conception formed of it without the aid of something else, is not independent, but is dependent upon that something else.
d. In the fourth place Spinoza defines attributes, which, as the moment coming second to substance, belong to it. “By attribute I understand that which the mind perceives as constituting the essence of substance;” and to Spinoza this alone is true. This is an important determination; the attribute is undoubtedly a determinateness, but at the same time it remains a totality. Spinoza, like Descartes, accepts only two attributes, thought and extension. The understanding grasps them as the reality of substance, but the reality is not higher than the substance, for it is only reality in the view of the understanding, which falls outside substance. Each of the two ways of regarding substance—extension and thought—contains no doubt the whole content of substance, but only in one form, which the understanding brings with it; and for this very reason both sides are in themselves identical and infinite. This is the true completion; but where substance passes over into attribute is not stated.
e. The fifth definition has to do with what comes third in relation to substance, the mode. “By mode I understand the affections of substance, or that which is in something else, through the aid of which also it is conceived.” Thus substance is conceived through itself; attribute is not conceived through itself, but has a relation to the conceiving understanding, in so far as this last conceives reality; mode, finally, is what is not conceived as reality, but through and in something else.
These last three moments Spinoza ought not merely to have established in this way as conceptions, he ought to have deduced them; they are especially important, and correspond with what we more definitely distinguish as universal, particular and individual. They must not, however, be taken as formal, but in their true concrete sense; the concrete universal is substance, the concrete particular is the concrete species; the Father and Son in the Christian dogma are similarly particular, but each of them contains the whole nature of God, only under a different form. The mode is the individual, the finite as such, which enters into external connection with what is “other.” In this Spinoza only descends to a lower stage, the mode is only the foregoing warped and stunted. Spinoza’s defect is therefore this, that he takes the third moment as mode alone, as a false individuality. True individuality and subjectivity is not a mere retreat from the universal, not merely something clearly determinate; for, as clearly determinate, it is at the same time Being-for-itself, determined by itself alone. The individual, the subjective, is even in being so the return to the universal; and in that it is at home with itself, it is itself the universal. The return consists simply and solely in the fact of the particular being in itself the universal; to this return Spinoza did not attain. Rigid substantiality is the last point he reached, not infinite form; this he knew not, and thus determinateness continually vanishes from his thought.
f. In the sixth place, the definition of the infinite is also of importance, for in the infinite Spinoza defines more strictly than anywhere else the Notion of the Notion. The infinite has a double significance, according as it is taken as the infinitely many or as the absolutely infinite (_infra_, p. 263). “The infinite in its kind is not such in respect of all possible attributes; but the absolutely infinite is that to whose essence all belongs that expresses an essence and contains no negation.” In the same sense Spinoza distinguishes in the nine-and-twentieth Letter (Oper. T. I. pp. 526-532) the infinite of imagination from the infinite of thought (_intellectus_), the actual (_actu_) infinite. Most men, when they wish to strive after the sublime, get no farther than the first of these; this is the false infinite, just as when one says “and so on into infinity,” meaning perhaps the infinity of space from star to star, or else the infinity of time. An infinite numerical series in mathematics is exactly the same thing. If a certain fraction is represented as a decimal fraction, it is incomplete; ⅐ is, on the contrary, the true infinite, and therefore not an incomplete expression, although the content here is of course limited. It is infinity in the incorrect sense that one usually has in view when infinity is spoken of; and even if it is looked on as sublime, it yet is nothing present, and only goes ever out into the negative, without being actual (_actu_). But for Spinoza the infinite is not the fixing of a limit and then passing beyond the limit fixed—the sensuous infinity—but absolute infinity, the positive, which has complete and present in itself an absolute multiplicity which has no Beyond. Philosophic infinity, that which is infinite _actu_, Spinoza therefore calls the absolute affirmation of itself. This is quite correct, only it might have been better expressed as: “It is the negation of negation.” Spinoza here also employs geometrical figures as illustrations of the Notion of infinity.
In his _Opera postuma_, preceding his Ethics, and also in the letter quoted above, he has two circles, one of which lies within the other, which have not, however, a common centre.
“The inequalities of the space between A B and C D exceed every number; and yet the space which lies between is not so very great.” That is to say, if I wish to determine them all, I must enter upon an infinite series. This “beyond” always, however, remains defective, is always affected with negation; and yet this false infinite is there to hand, circumscribed, affirmative, actual and present in that plane as a complete space between the two circles. Or a finite line consists of an infinite number of points; and yet the line is present here and determined; the “beyond” of the infinite number of points, which are not complete, is in it complete and called back into unity. The infinite should be represented as actually present, and this comes to pass in the Notion of the cause of itself, which is therefore the true infinity. As soon as the cause has something else opposed to it—the effect—finitude is present; but here this something else is at the same time abrogated and it becomes once more the cause itself. The affirmative is thus negation of negation, since, according to the well-known grammatical rule, _duplex negatio affirmat_. In the same way Spinoza’s earlier definitions have also the infinite already implied in them, for instance in the case of the just mentioned cause of itself, inasmuch as he defines it as that whose essence involves existence (_supra_, p. 258). Notion and existence are each the Beyond of the other; but cause of itself, as thus including them, is really the carrying back of this “beyond” into unity. Or (_supra_, p. 259) “Substance is that which is in itself and is conceived from itself;” that is the same unity of Notion and existence.
The infinite is in the same way in itself and has also its Notion in itself; its Notion is its Being, and its Being its Notion; true infinity is therefore to be found in Spinoza. But he has no consciousness of this; he has not recognized this Notion as absolute Notion, and therefore has not expressed it as a moment of true existence; for with him the Notion falls outside of existence, into the thought of existence.
g. Finally Spinoza says in the seventh place: “God is a Being absolutely infinite, _i.e._ a substance consisting of infinite attributes, each of which expresses an eternal and infinite essence.” Does substance, one might here ask, possess an infinite number of attributes? But as with Spinoza there are only two attributes, thought and extension, with which he invests God, “infinite” is not to be taken here in the sense of the indeterminate many, but positively, as a circle is perfect infinity in itself.
The whole of Spinoza’s philosophy is contained in these definitions, which, however, taken as a whole are formal; it is really a weak point in Spinoza that he begins thus with definitions. In mathematics this method is permitted, because at the outset we there make assumptions, such as that of the point and line; but in Philosophy the content should be known as the absolutely true. It is all very well to grant the correctness of the name-definition, and acknowledge that the word “substance” corresponds with the conception which the definition indicates, but it is quite another question to determine whether this content is absolutely true. Such a question is not asked in the case of geometrical propositions, but in philosophic investigation it is the very thing to be first considered, and this Spinoza has not done. Instead of only explaining these simple thoughts and representing them as concrete in the definitions which he makes, what he ought to have done was to examine whether this content is true. To all appearance it is only the explanation of the words that is given; but the content of the words is held to be established. All further content is merely derived from that, and proved thereby; for on the first content all the rest depends, and if it is established as a basis, the other necessarily follows. “The attribute is that which the understanding thinks of God.” But here the question is: How does it come that besides the Deity there now appears the understanding, which applies to absolute substance the two forms of thought and extension? and whence come these two forms themselves?
Thus everything proceeds inwards, and not outwards; the determinations are not developed from substance, it does not resolve itself into these attributes.