sciences which have hypotheses as their principle, and where those who contemplate them have to do so with the understanding and not with the senses. Yet because in their contemplation they do not ascend to the absolute principle, but speculate from hypotheses, they appear not to exercise thought (νοῦν) upon these objects, although these objects are cognizable by thought if a principle is added to them (νοητῶν ὄντων μετὰ ἀρχῆς). The methods (ἕξιν) of geometry and its kindred sciences you appear to me to call understanding; and that because it stands midway between reason (νοῦς) and ‘sensuous’ opinion (δόξα).”—“You have quite grasped my meaning. Corresponding to these four sections, I will suppose four faculties (παθήματα) in the soul—conceiving reason (νόησις) has the highest place (ἐπὶ τῷ ἀνωτάτῳ), understanding the second; the third is called faith (πίστις)”—the true conception for animals and plants in that they are living, homogeneous and identical with ourselves; “and the last the knowledge of images (εἰκασία),” opinion. “Arrange them according to the fact that each stage has as much clearness (σαφηνείας) as that to which it is related has truth.”
This is the distinction which forms the basis of Plato’s philosophy, and which came to be known from his writings.
Now if we go from knowledge to its content, in which the Idea becomes sundered, and thereby organizes itself more completely into a scientific system, this content, according to Plato, begins to fall into three parts which we distinguish as the logical, natural, and mental philosophy. The logical Philosophy the ancients called dialectic, and its addition to philosophy is by the ancient writers on the subject ascribed to Plato (Vol. I. p. 387). This is not a dialectic such as we met with in the Sophists, which merely brings one’s ideas altogether into confusion, for this first branch of Platonic philosophy is the dialectic which moves in pure Notions—the movement of the speculatively logical, with which several dialogues, and particularly that of Parmenides, occupy themselves. The second, according to Plato, is a kind of natural philosophy, the principles of which are more especially propounded in the Timæus. The third is the philosophy of the mind—an ethical philosophy—and its representation is essentially that of a perfect state in the Republic. The Critias should be taken in connection with the Timæus and the Republic, but we need not make further reference to it, for it is only a fragment. Plato makes these three dialogues one connected conversation. In the Critias and the Timæus the subject is so divided that while the Timæus dealt with the speculative origin of man and of nature, the Critias was intended to represent the ideal history of human culture, and to be a philosophical history of the human race, forming the ancient history of the Athenians as preserved by the Egyptians. Of this, however, only the beginning has come down to us.[29] Hence if the Parmenides be taken along with the Republic and the Timæus, the three together constitute the whole Platonic system of philosophy divided into its three parts or sections. We now wish to consider the philosophy of Plato more in detail in accordance with these three different points of view.
1. DIALECTIC.
We have already remarked by way of preparation that the Notion of true dialectic is to show forth the necessary movement of pure Notions, without thereby resolving these into nothing; for the result, simply expressed, is that they are this movement, and the universal is just the unity of these opposite Notions. We certainly do not find in Plato a full consciousness that this is the nature of dialectic, but we find dialectic itself present; that is, we find absolute existence thus recognized in pure Notions, and the representation of the movement of these Notions. What makes the study of the Platonic dialectic difficult is the development and the manifestation of the universal out of ordinary conceptions. This beginning, which appears to make knowledge easier, really makes the difficulty greater, since it introduces us into a field in which there is quite a different standard from what we have in reason, and makes this field present to us; when, on the contrary, progression and motion take place in pure Notions alone, the other is not remembered at all. But in that very way the Notions attain greater truth. For otherwise pure logical movement might easily appear to us to exist on its own account, like a private territory, which has another region alongside of it, also having its own particular place. But since both are there brought together, the speculative element begins to appear as it is in truth; that is, as being the only truth, and that, indeed, through the transformation of sensuous opinion into thought. For in our consciousness we first of all find the immediate individual, the sensuous real; or there are also categories of the understanding which are held by us to be ultimate and true. But contrasted with merely external reality, it is rather the ideal that is the most real, and it was Plato who perceived that it was the only real, for he characterized the universal or thought as the true, in opposition to what is sensuous.
Thus the aim of many of Plato’s Dialogues, which conclude without any positive affirmation (Vol. I. p. 406; II. p. 13), is to show that the immediately existent, the many things that appear to us, although we may have quite true conceptions of them, are still not in themselves, in an objective sense, the true, because they alter and are determined through their relation to something else and not through themselves; thus we must even in the sensuous individuals consider the universal, or what Plato has called the Idea (p. 29). The sensuous, limited, and finite is, in fact, both itself and the other, which is also considered as existent; and thus there is an unsolved contradiction, for the other has dominion in the first. We have been before reminded (Vol. I. p. 404; II. p. 33) that the aim of the Platonic dialectic is to confuse and to resolve the finite ideas of men, in order to bring about in their consciousness what science demands, the consideration of that which is. By being thus directed against the form of the finite, dialectic has in the first place the effect of confounding the particular, and this is brought about by the negation therein present being shown forth, so that, in fact, it is proved that it is not what it is, but that it passes into its opposite, into the limitations which are essential to it. But if this dialectic is laid hold of, the particular passes away and becomes another than that which it is taken to be. Formal philosophy cannot look at dialectic in any other way than as being the art of confusing ordinary conceptions or even Notions, and demonstrating their nullity, thus making their result to be merely negative. For this reason, Plato in his Republic (VII. pp. 538, 539, Steph.; pp. 370, 371, Bekk.) advised the citizens not to allow dialectic to be studied before the thirtieth year, because by its means anyone might transform the beautiful, as he had received it from his masters, into that which is hateful. We find this dialectic a great deal in Plato, both in the more Socratic and moralizing dialogues, and in the many dialogues which relate to the conceptions of the Sophists in regard to science.
In connection with this, the second part of dialectic makes its first aim the bringing of the universal in men to consciousness, which, as we formerly remarked when speaking of Socrates (Vol. I. p. 398), was the main interest of Socratic culture. From this time on, we may look at such an aim as having been discarded, and simply remark that a number of Plato’s Dialogues merely aim at bringing to consciousness a general conception, such as we have without taking any trouble at all (Vol. I. pp. 403, 404); hence this prolixity on Plato’s part often wearies us. This dialectic is, indeed, also a movement of thought, but it is really only necessary in an external way and for reflecting consciousness, in order to allow the universal, what is in and for itself, unalterable and immortal, to come forth. Hence these first two sides of the dialectic, directed as they are towards the dissolution of the particular and thus to the production of the universal, are not yet dialectic in its true form: it is a dialectic which Plato has in common with the Sophists, who understood very well how to disintegrate the particular. A subject which Plato very often treats of with this end in view, is virtue, which he proves to be only one (Vol. I. pp. 405, 411), and thereby he makes the universal good emerge from the particular virtues.
Now because the universal which has emerged from the confusion of the particular, _i.e._ the true, beautiful and good, that which taken by itself is species, was at first undetermined and abstract, it is, in the third place, a principal part of Plato’s endeavours further to determine this universal in itself. This determination is the relation which the dialectic movement in thought bears to the universal, for through this movement the Idea comes to these thoughts which contain the opposites of the finite within themselves. For the Idea, as the self-determining, is the unity of these differences, and thus the determinate Idea. The universal is hence determined as that which resolves and has resolved the contradictions in itself, and hence it is the concrete in itself; thus this sublation of contradiction is the affirmative. Dialectic in this higher sense is the really Platonic; as speculative it does not conclude with a negative result, for it demonstrates the union of opposites which have annulled themselves. Here begins what is difficult for the understanding to grasp. The form of Plato’s methods being not yet, however, developed purely on its own account, this is the reason that his dialectic is still often merely reasoning, and that it proceeds from individual points of view and frequently remains without result. On the other hand, Plato’s own teaching is directed against this merely reasoning dialectic; yet we see that it gives him trouble properly to show forth the difference. The speculative dialectic which commences with him, is thus the most interesting but also the most difficult part of his work; hence acquaintance is not usually made with it when the Platonic writings are studied. Tennemann, for example, did not at all comprehend what was most important in the Platonic philosophy, and only gathered some of it together in the form of dry ontological determinations—for that was what he could comprehend. But it shows the greatest lack of intellect in a historian of Philosophy only to see in a great philosophic form whether there is anything yielding profit to himself or not.
What we have thus to deal with in the dialectic of Plato is the pure thought of reason, from which he very clearly distinguishes the understanding (διάνοια), (_supra_, p. 47). We may have thoughts about many things—if indeed, we do have thought at all—but this is not what Plato means. Plato’s true speculative greatness, and that through which he forms an epoch in the history of Philosophy, and hence in the history of the world, lies in the fuller determination of the Idea; this extension of knowledge is one which some centuries later constituted the main element in the ferment which took place in universal history, and in the transformation which the human mind passed through. This fuller determination may, from what has gone before, be understood thus: Plato first comprehended the Absolute as the Being of Parmenides, but as the Universal which, as species, is also end, _i.e._ which rules, penetrates, and produces the particular and manifold. Plato, however, had not yet developed this self-producing activity, and hence often stumbled into an external teleology. As the union of the preceding principles, Plato further led this Being into determinateness and into difference, as the latter is contained in the triad of Pythagorean number-determinations, and expressed the same in thought. That is, he grasped the Absolute as the unity of Being and non-being—in Becoming, as Heraclitus says—or of the one and the many,[30] &c. He further now took into the objective dialectic of Heraclitus the Eleatic dialectic, which is the external endeavour of the subject to show forth contradiction, so that in place of an external changing of things, their inward transition in themselves, _i.e._ in their Ideas, or, as they are here, in their categories, has come to pass out of and through themselves. Plato finally set forth the belief of Socrates, which the latter put forward in regard to the moral self-reflection of the subject only, as objective, as the Idea, which is both universal thought and the existent. The previous philosophies thus do not disappear because refuted by Plato, being absorbed in him.
In addition to Being and non-being, one and many, the unlimited and limiting are, for instance, likewise pure thoughts such as these, in whose absolute contemplation, from an all-embracing point of view, the Platonic investigation occupies itself. The purely logical and quite abstruse consideration of such objects certainly contrasts strongly with our conception of the beautiful, pleasing, and attractive content of Plato. Such consideration to him signifies all that is best in Philosophy, and it is that which he everywhere calls the true method of Philosophy, and the knowledge of the truth; in it he places the distinction between philosophers and Sophists. The Sophists on their part look at appearances, and these they obtain in opinion; this, indeed, implies thought, but not pure thought, or what is in and for itself. This is one reason why many turn from the study of Plato’s works unsatisfied. When we commence a Dialogue, we find, in the free Platonic method of composition, beautiful scenes in nature, a superb introduction (p. 14) that promises to lead us through flowery fields into Philosophy—and that the highest Philosophy, the Platonic. We meet with elevated thoughts, which are responded to more specially by youth, but these soon disappear. If at first we have allowed ourselves to be carried away by these bright scenes, they must now be all renounced, and as we have come to the real dialectic, and truly speculative, we must keep to the wearisome path, and allow ourselves to be pricked by the thorns and thistles of metaphysics. For behold, we then come to what is best and highest, to investigations respecting the one and many, Being and nothing; this was not what was anticipated, and men go quietly away, only wondering that Plato should seek knowledge here. From the most profound dialectic investigation, Plato then again proceeds to representations and images, to the description of dialogues amongst intelligent men. Thus in the Phædo, for example, which Mendelssohn has modernized and transformed into Wolffian metaphysics, the beginning and end are elevating and beautiful, and the middle deals with dialectic. Hence in making one’s way through Plato’s Dialogues very many mental qualities are called into play, and in their study we consequently ought to keep our minds open and free as regards the very various points of interest. If we read with interest what is speculative, we are apt to overlook what is most beautiful; if our interest lies in the elevation and culture of the mind, we forget the speculative element and find that it does not appeal to us. With some it is like the young man in the Bible, who had fulfilled his various duties, and who asked Christ what good thing he still had to do to become His follower. But when the Lord commanded him to sell what he had and give to the poor, the young man went away sorrowful; this was not what he had anticipated. Just in the same way many mean well as regards Philosophy; they study Fries, and heaven knows whom else. Their hearts are full of the true, good and beautiful; they would know and see what they ought to do, but their breasts swell with goodwill alone.
While Socrates remained at the good and universal, at implicitly concrete thoughts, without having developed them or having revealed them through development, Plato certainly goes on to the Idea as determined. His defect, however, is that this determinateness and that universality are still outside one another. We should certainly obtain the determinate Idea by reducing the dialectic movement to its result, and that forms an important element in knowledge. Yet when Plato speaks of justice, beauty, goodness, truth, their origin is not revealed; they are not shown as being results, but merely as hypotheses accepted in their immediacy. Consciousness certainly has an innate conviction that they form the highest end, but this their determination is not discovered. Since Plato’s dogmatic expositions of Ideas are lost (_supra_, p. 11), the dialectic of pure thought is only placed before us by the Dialogues dealing with the subject, and these, just because they deal with pure thought, are amongst the most difficult, viz.: the Sophist, the Philebus, and, more especially, the Parmenides. We here pass over the Dialogues which contain only negative dialectic and Socratic dialogue, because they treat only of concrete ideas and not of dialectic in its higher signification; they leave us unsatisfied, because their ultimate end is only to confuse one’s opinions, or awaken a sense of the necessity for knowledge. But those three express the abstract speculative Idea in its pure Notion. The embracing of the opposites in one, and the expression of this unity, is chiefly lacking in the Parmenides, which has hence, like some other Dialogues, only a negative result. But both in the Sophist and the Philebus Plato expresses the unity also.
_a._ The fully worked-out and genuine dialectic is, however, contained in the Parmenides—that most famous masterpiece of Platonic dialectic. Parmenides and Zeno are there represented as meeting Socrates in Athens; but the most important part of it is the dialectic which is put in the mouths of Parmenides and Zeno. At the very beginning the nature of this dialectic is given in detail as follows: Plato makes Parmenides praise Socrates thus: “I notice that in conversing with Aristoteles,” (one of those present; it might quite well have been the philosopher, but that he was born sixteen years after Socrates’ death) “you were trying to define in what the nature of the beautiful, just and good, and all such ideas lay. This your endeavour is noble and divine. But train and exercise yourself even more in what the multitude call idle chatter, and look on as useless, as long as you are young, for otherwise the truth will escape you.—In what, Socrates asks, does this exercise consist?—I was much pleased because you said before that we must not be content with contemplating the sensuous and its illusions, but must consider that which thought alone can grasp, and that which alone exists.” I have before[31] remarked that men at all times have believed that the truth could be found through reflection only, for in reflection thought is found, and that which we have before us in the guise of ordinary conception and of belief is transformed into thought. Socrates now replies to Parmenides: “I believed that I should in that way best discern the like and unlike, and the other general determinations in things.” Parmenides replies, “Certainly. But if you begin from a point of view such as that, you must not only consider what follows from such an hypothesis, but also what follows from the opposite of that hypothesis. For example, in the case of the hypothesis ‘the many is,’ you have to consider what will be the consequences of the relation of the many to itself and to the one, and likewise what the consequences of the relation of the one to itself and to the many.” The marvellous fact that meets us in thought when we take determinations such as these by themselves, is that each one is turned round into the opposite of itself. “But again we must consider, if the many is not, as to what will be the result as regards the one and the many, both to themselves and to one another. The same consideration must be employed in respect of identity and non-identity, rest and motion, origination and passing away, and likewise in regard to Being and non-being. We must ask what is each of these in relation to itself, and what is their relation in event of the one or the other being accepted? In exercising yourself fully in this, you will learn to know real truth.”[32] Plato thus lays great stress on the dialectical point of view, which is not the point of view of the merely external, but is a living point of view whose content is formed of pure thoughts only, whose movement consists in their making themselves the other of themselves, and thus showing that only their unity is what is truly justified.
Plato makes Socrates say, as regards the meaning of the unity of the one and many, “If anyone proved to me that I am one and many, it would not surprise me. For since he shows me that I am a many, and points out in me the right and left side, an upper and lower half, a front and back, I partake of the manifold; and again I partake of unity because I am one of us seven. The case is the same with stone, wood, &c. But if anyone, after determining the simple ideas of similarity and dissimilarity, multiplicity, and unity, rest and movement, and so on, were to show that these in their abstract form admit of admixture and separation, I should be very much surprised.”[33] The dialectic of Plato is, however, not to be regarded as complete in every regard. Though his main endeavour is to show that in every determination the opposite is contained, it can still not be said that this is strictly carried out in all his dialectic movements, for there are often external considerations which exercise an influence in his dialectic. For example, Parmenides says: “Are either of the two parts of the one which is—I mean the One and Being—ever wanting to one another? Is the One ever set free from _being_ a part (τοῦ εἶναι μόριον) and Being set free from the _one_ part (τοῦ ἑνὸς μόριου)? Once more, each part thus possesses both the one and Being, and the smallest part still always consists of these two parts.”[34] In other words: “The one is; from this it follows that the one is not synonymous with ‘is,’ and thus the one and ‘is’ are distinguished. There hence is in the proposition ‘the one is’ a distinction; the many is therefore contained in it, and thus even with the one I express the many.” This dialectic is certainly correct, but it is not quite pure, because it begins from this union of two determinations.
The result of the whole investigation in the Parmenides is summarized at the close by saying “that whether the one is or is not, it, as also the many (τἆλλα), in relation to themselves and in relation to one another—all of them both are and are not, appear and do not appear.”[35] This result may seem strange. We are far from accepting, in our ordinary conception of things, quite abstract determinations such as the one, Being, non-being, appearance, rest, movement, &c., as Ideas; but these universals are taken by Plato as Ideas, and this Dialogue thus really contains the pure Platonic doctrine of Ideas. He shows of the one that when it is as well as when it is not, whether like itself or not like itself, both in movement and rest, origination and decay, it both is and is not; or the unity as well as all these pure Ideas, both are and are not, the one is one as much as it is many. In the proposition “the one is,” it is also implied that “the one is not one but many;” and, conversely, “the many is” also indicates that “the many is not many, but one.” They show themselves dialectically and are really the identity with their ‘other’; and this is the truth. An example is given in Becoming: in Becoming Being and non-being are in inseparable unity, and yet they are also present there as distinguished; for Becoming only exists because the one passes into the other.
In this respect, perhaps, the result arrived at in the Parmenides may not satisfy us, since it seems to be negative in character, and not, as the negation of the negation, expressive of true affirmation. Nevertheless, the Neo-platonists, and more especially Proclus, regard the result arrived at in the Parmenides as the true theology, as the true revelation of all the mysteries of the divine essence. And it cannot be regarded as anything else, however little this may at first appear, and though Tiedemann (Platon. Argumenta, p. 340) speaks of these assertions as merely the wild extravagances of the Neo-platonists. In fact, however, we understand by God the absolute essence of things, which even in its simple Notion is the unity and movement of these pure realities, the Ideas of the one and many, &c. The divine essence is the Idea in general, as it is either for sensuous consciousness or for thought. In as far as the divine Idea is the absolute self-reflection, dialectic is nothing more than this activity of self-reflection in itself; the Neo-Platonists regarded this connection as metaphysical only, and have recognized in it their theology, the unfolding of the secrets of the divine essence. But here there appears the double interpretation already remarked upon (p. 19), which has now to be more clearly expounded. It is that God and the essential reality of things may be understood in two different ways. For, on the one hand, when it is said that the essential reality of things is the unity of opposites, it would seem as though only the immediate essence of these immediately objective things were indicated, and as if this doctrine of real essence or ontology were distinguished from the knowledge of God, or theology. These simple realities and their relation and movement seem only to express moments of the objective and not mind, because there is lacking in them one element—that is to say, reflection into themselves—which we demand for the existence of the divine essence. For mind, the truly absolute essence, is not only the simple and immediate, but that which reflects itself into itself, for which in its opposition the unity of itself and of that which is opposed is; but these moments and their movement do not present it as such, for they make their appearance as simple abstractions. On the other hand, they may also be taken to be pure Notions, which pertain purely to reflection into itself. In this case Being is wanting to them, or what we likewise demand for reflection into itself as essential to the divine essence; and then their movement is esteemed an empty round of empty abstractions, which belong only to reflection and have no reality. For the solution of this contradiction we must know the nature of apprehension and knowledge, in order to obtain in the Notion everything there present. Thus shall we have the consciousness that the Notion is in truth neither the immediate only, although it is the simple, nor merely that which reflects itself into itself, the thing of consciousness; for it is of spiritual simplicity, thus really existent—as it is thought turned back on itself, so it is also Being in itself, _i.e._ objective Being, and consequently all reality. Plato did not state this knowledge of the nature of the Notion so expressly, nor did he say that this essential Being of things is the same as the divine essence. But really it is simply not put into words, for the fact is undoubtedly present, and the only distinction is one of speech as between the mode of the ordinary conception and that of the Notion. On the one hand, this reflection into itself, the spiritual, the Notion, is present in the speculation of Plato; for the unity of the one and many, &c., is just this individuality in difference, this being-turned-back-within-itself in its opposite, this opposite which is implicit; the essential reality of the world is really this movement returning into itself of that which is turned back within itself. But, on the other hand, for this very reason, this being reflected into self—like the God of ordinary conception—still remains with Plato something separated; and in his representation of the Becoming of Nature in the Timæus, God, and the essential reality of things, appear as distinguished.
_b._ In the Sophist Plato investigated the pure Notions or Ideas of movement and rest, self-identity and other-being, Being and non-being. He here proves, as against Parmenides, that non-being is, and likewise that the simple self-identical partakes of other-being, and unity of multiplicity. He says of the Sophists that they never get beyond non-being, and he also refutes their whole ground-principle, which is non-being, feeling, and the many. Plato has thus so determined the true universal, that he makes it the unity of, for example, the one and many, Being and non-being; but at the same time he has avoided, or it was his endeavour to avoid, the double meaning which lies in our talk of the unity of Being and nothing, &c. For in this expression we emphasize the unity, and then the difference disappears, just as if we merely abstracted from it. Plato tried, however, to preserve the difference likewise. The Sophist is a further development of Being and non-being, both of which are applicable to all things; for because things are different, the one being the other of the other, the determination of the negative is present. First of all, however, Plato expresses in the Sophist a clearer consciousness of Ideas as abstract universalities, and his conviction that this point of view could not endure, because it was opposed to the unity of the Idea with itself. Plato thus first refutes what is sensuous, and then even the Ideas themselves. The first of these points of view is what is