Since we now speak more fully of this matter, we must in the second place consider the nature of knowledge according to Plato, and in so doing commence our account of the Platonic philosophy itself.
a. Plato gave a more precise definition of philosophers as those “who are eager to behold the truth.”—Glaucon: “That is quite right. But how do you explain it?” Socrates: “I tell this not to everyone, but you will agree with me in it.” “In what?” “In this, that as the Beautiful is opposed to the Ugly, they are two things.” “Why not?” “With the Just and the Unjust, the Good and the Evil, and every other Idea (εἶδος) the case is the same, that each of them is by itself a One; on the other hand, on account of its combination with actions and bodies and other Ideas springing up on every side, each appears as a Many.” “You are right.” “I distinguish now, according to this, between the sight-loving, art-loving, busy class on the one side, and those on the other side, of whom we were just speaking as alone entitled to be called philosophers.” “What do you mean by that?” “I mean by that, such as delight in seeing and hearing, who love beautiful voices, and colours, and forms, and all that is composed thereof, while their mind is still incapable of seeing and loving the Beautiful in its own nature.” “Such is the case.” “Those, however, who have the power of passing on to the Beautiful itself, and seeing what it is in itself (καθ̓ αὐτό), are they not rare?” “They are indeed.” “He then who sees that beautiful things are beautiful, but does not apprehend Beauty itself, and cannot follow if another should seek to lead him to the knowledge of the same,—think you that he lives his life awake, or in a dream?” (That is to say, those who are not philosophers are like men who dream.) “For look, is it not dreaming when one in sleep, or even when awake, takes what merely resembles a certain thing to be not something that resembles it, but the very thing that it is like?” “I should certainly say of such an one that he was dreaming.” “The waking man, on the other hand, is he who holds the Beautiful itself to be the Existent, and can recognize its very self as well as that which only partakes of it (μετέχονυα), and does not confuse between the two.”[17]
In this account of Philosophy, we at once see what the so much talked of Ideas of Plato are. The Idea is nothing else than that which is known to us more familiarly by the name of the Universal, regarded, however, not as the formal Universal, which is only a property of things, but as implicitly and explicitly existent, as reality, as that which alone is true. We translate εἶδος first of all as species or kind; and the Idea is no doubt the species, but rather as it is apprehended by and exists for Thought. Of course when we understand by species nothing but the gathering together by our reflection, and for convenience sake, of the like characteristics of several individuals as indicating their distinguishing features, we have the universal in quite an external form. But the specific character of the animal is its being alive; this being alive is that which makes it what it is, and deprived of this, it ceases to exist. To Plato, accordingly, Philosophy is really the science of this implicitly universal, to which, as contrasted with the particular, he always continues to return. “When Plato spoke of tableness and cupness, Diogenes the Cynic said: ‘I see a table and a cup, to be sure, but not tableness and cupness.’ ‘Right,’ answered Plato; ‘for you have eyes wherewith to see the table and the cup, but mind, by which one sees tableness and cupness, you have not (νοῦν οὐκ ἔχεις).’”[18] What Socrates began was carried out by Plato, who acknowledged only the Universal, the Idea, the Good, as that which has existence. Through the presentation of his Ideas, Plato opened up the intellectual world, which, however, is not beyond reality, in heaven, in another place, but is the real world. With Leucippus, too, the Ideal is brought closer to reality, and not—metaphysically—thrust away behind Nature. The essence of the doctrine of Ideas is thus the view that the True is not that which exists for the senses, but that only what has its determination in itself, the implicitly and explicitly Universal, truly exists in the world; the intellectual world is therefore the True, that which is worthy to be known—indeed, the Eternal, the implicitly and explicitly divine. The differences are not essential, but only transitory; yet the Absolute of Plato, as being the one in itself and identical with itself, is at the same time concrete in itself, in that it is a movement returning into itself, and is eternally at home with itself. But love for Ideas is that which Plato calls enthusiasm.
The misapprehension of Plato’s Ideas takes two directions; one of these has to do with the thinking, which is formal, and holds as true reality the sensuous alone, or what is conceived of through the senses—this is what Plato asserts to be mere shadows. For when Plato speaks of the Universal as the real, his conception of it is met either by the statement that the Universal is present to us only as a property, and is therefore a mere thought in our understanding, or else that Plato takes this same Universal as substance, as an existence in itself, which, however, falls outside of us. When Plato further uses the expression that sensuous things are, like images (εἰκόνες), similar to that which has absolute existence, or that the Idea is their pattern and model (παραδεῖγμα), if these Ideas are not exactly made into things, they are made into a kind of transcendent existences which lie somewhere far from us in an understanding outside this world, and are pictures set up which we merely do not see; they are like the artist’s model, following which he works upon a given material, and thereon impresses the likeness of the original. And owing to their not only being removed from this sensuous present reality, which passes for truth, but also being liberated from the actuality of the individual consciousness, their subject, of which they are originally the representations, passes out of consciousness, and even comes to be represented only as something which is apart from consciousness.
The second misapprehension that prevails with regard to these Ideas takes place when they are not transferred beyond our consciousness, but pass for ideals of our reason, which are no doubt necessary, but which produce nothing that either has reality now or can ever attain to it. As in the former view the Beyond is a conception that lies outside the world, and in which species are hypostatized, so in this view our reason is just such a realm beyond reality. But when species are looked on as if they were the forms of reality in us, there is again a misapprehension, just as if they were looked at as æsthetic in nature. By so doing, they are defined as intellectual perceptions which must present themselves immediately, and belong either to a happy genius or else to a condition of ecstasy or enthusiasm. In such a case they would be mere creations of the imagination, but this is not Plato’s nor the true sense. They are not immediately in consciousness, but they are in the apprehending knowledge; and they are immediate perceptions only in so far as they are apprehending knowledge comprehended in its simplicity and in relation to the result; in other words, the immediate perception is only the moment of their simplicity. Therefore we do not possess them, they are developed in the mind through the apprehending knowledge; enthusiasm is the first rude shape they take, but knowledge first brings them to light in rational developed form; they are in this form none the less real, for they alone are Being.
On this account Plato first of all distinguishes Science, the Knowledge of the True, from opinion. “Such thinking (διάνοιαν) as of one who knows, we may justly call knowledge (γνώμην); but the other, opinion (δόξαν). Knowledge proceeds from that which is; opinion is opposed to it; but it is not the case that its content is Nothing—that would be ignorance—for when an opinion is held, it is held about Something. Opinion is thus intermediate between ignorance and science, its content is a mixture of Being and Nothing. The object of the senses, the object of opinion, the particular, only participates in the Beautiful, the Good, the Just, the Universal; but it is at the same time also ugly, evil, unjust, and so on. The double is at the same time the half. The particular is not only large or small, light or heavy, and any one of these opposites, but every particular is as much the one as the other. Such a mixture of Being and non-Being is the particular, the object of opinion;”[19]—a mixture in which the opposites have not resolved themselves into the Universal. The latter would be the speculative Idea of knowledge, while to opinion belongs the manner of our ordinary consciousness.
b. Before we commence the examination of the objective implicitly existent content of knowledge, we must consider more in detail, on the one hand, the subjective existence of knowledge in consciousness as we find it in Plato, and, on the other, how the content is or appears in ordinary conception as soul; and the two together form the relation of knowledge, as the universal, to the individual consciousness.
α. The source through which we become conscious of the divine is the same as that already seen in Socrates (Vol. I. pp. 410, 411). The spirit of man contains reality in itself, and in order to learn what is divine he must develop it out of himself and bring it to consciousness. With the Socratics this discussion respecting the immanent nature of knowledge in the mind of man takes the form of a question as to whether virtue can be taught or not, and with the sophist Protagoras of asking whether feeling is the truth, which is allied with the question of the content of scientific knowledge, and with the distinction between that and opinion. But Plato goes on to say that the process by which we come to know is not, properly speaking, learning, for that which we appear to learn we really only recollect. Plato often comes back to this subject, but in particular he treats of the point in the Meno, in which he asserts (p. 81, 84 Steph.; p. 349, 355, 356 Bekk.) that nothing can, properly speaking, be learned, for learning is just a recollection of what we already possess, to which the perplexity in which our minds are placed, merely acts as stimulus. Plato here gives the question a speculative significance, in which the reality of knowledge, and not the empirical view of the acquisition of knowledge, is dealt with. For learning, according to the immediate ordinary conception of it, expresses the taking up of what is foreign into thinking consciousness, a mechanical mode of union and the filling of an empty space with things which are foreign and indifferent to this space itself. An external method of effecting increase such as this, in which the soul appears to be a tabula rasa, and which resembles the idea we form of growth going on in the living body through the addition of particles, is dead, and is incompatible with the nature of mind, which is subjectivity, unity, being and remaining at home with itself. But Plato presents the true nature of consciousness in asserting that it is mind in which, as mind, that is already present which becomes object to consciousness, or which it explicitly becomes. This is the Notion of the true universal in its movement; of the species which is in itself its own Becoming, in that it is already implicitly what it explicitly becomes—a process in which it does not come outside of itself. Mind is this absolute species, whose process is only the continual return into itself; thus nothing is for it which it is not in itself. According to this, the process of learning is not that something foreign enters in, but that the mind’s own essence becomes actualized, or it comes to the knowledge of this last. What has not yet learned is the soul, the consciousness represented as natural being. What causes the mind to turn to science is the semblance, and the confusion caused through it, of the essential nature of mind being something different, or the negative of itself—a mode of manifestation which contradicts its real nature, for it has or is the inward certainty of being all reality. In that it abrogates this semblance of other-being, it comprehends the objective, i.e. gives itself immediately in it the consciousness of itself, and thus attains to science. Ideas of individual, temporal, transitory things undoubtedly come from without, but not the universal thoughts which, as the true, have their root in the mind and belong to its nature; by this means all authority is destroyed.
In one sense recollection [Erinnerung] is certainly an unfortunate expression, in the sense, namely, that an idea is reproduced which has already existed at another time. But recollection has another sense, which is given by its etymology, namely that of making oneself inward, going inward, and this is the profound meaning of the word in thought. In this sense it may undoubtedly be said that knowledge of the universal is nothing but a recollection, a going within self, and that we make that which at first shows itself in external form and determined as a manifold, into an inward, a universal, because we go into ourselves and thus bring what is inward in us into consciousness. With Plato, however, as we cannot deny, the word recollection has constantly the first and empirical sense. This comes from the fact that Plato propounds the true Notion that consciousness in itself is the content of knowledge, partly in the form of popular idea and in that of myths. Hence here even, the already mentioned (p. 18) intermingling of idea and Notion commences. In the Meno (p. 82-86 Steph.; p. 350-360 Bekk.) Socrates tries to show, by experiment on a slave who had received no instruction, that learning is a recollection. Socrates merely questions him, leaving him to answer in his own way, without either teaching him or asserting the truth of any fact, and at length brings him to the enunciation of a geometrical proposition on the relation which the diagonal of a square bears to its side. The slave obtains the knowledge out of himself alone, so that it appears as though he only recollected what he already knew but had forgotten. Now if Plato here calls this coming forth of knowledge from consciousness a recollection, it follows that this knowledge has been already in this consciousness, i.e. that the individual consciousness has not only the content of knowledge implicitly, in accordance with its essential nature, but has also possessed it as this individual consciousness and not as universal. But this moment of individuality belongs only to the ordinary conception, and recollection is not thought; for recollection relates to man as a sensuous “this,” and not as a universal. The essential nature of the coming forth of knowledge is hence here mingled with the individual, with ordinary conception, and knowledge here appears in the form of soul, as of the implicitly existent reality, the one, for the soul is still only a moment of spirit. As Plato here passes into a conception the content of which has no longer the pure significance of the universal, but of the individual, he further depicts it in the form of a myth. He represents the implicit existence of mind in the form of a pre-existence in time, as if the truth had already been for us in another time. But at the same time we must remark that he does not propound this as a philosophic doctrine, but in the form of a saying received from priests and priestesses who comprehend what is divine. Pindar and other holy men say the same. According to these sayings, the human soul is immortal; it both ceases to be, or, as men say, it dies, and it comes again into existence, but in no way perishes. “Now if the soul is immortal and often reappears” (metempsychosis), “and if it has seen that which is here as well as in Hades,” (in unconsciousness) “and everything else, learning has no more meaning, for it only recollects what it has already known.”[20] Historians seize upon this allusion to what is really an Egyptian idea, and a sensuous conception merely, and say that Plato has laid down that such and such was the case. But Plato made no such statement whatever; what he here says has nothing to do with Philosophy, and more particularly nothing to do with his philosophy, any more than what afterwards is said regarding God.
β. In other Dialogues this myth is further and more strikingly developed; it certainly employs remembrance in its ordinary sense, which is that the mind of man has in past time seen that which comes to his consciousness as the true and absolutely existent. Plato’s principal effort is, however, to show through this assertion of recollection, that the mind, the soul, thought, is on its own account free, and this has to the ancients, and particularly to the Platonic idea, a close connection with what we call immortality of the soul.