ββ. Knowledge in the form of soul, is more clearly dealt with in the Phædo, where Plato has further developed the ideas about the immortality of the soul. What in the Phædrus is kept definitely apart as myth and truth respectively, and which is made to appear as such, appears less evidently so in the Phædo—that celebrated dialogue in which Plato makes Socrates speak of the immortality of the soul. That Plato should have connected this discussion with the account of the death of Socrates has in all time been matter of admiration. Nothing could seem more suitable than to place the conviction of immortality in the mouth of him who is in the act of leaving life, and to make this conviction living to us through the scene, just as, on the other hand, a death-scene like this is made living to us through that conviction. We must at the same time remark that in what is fitting the following conditions are implied. It must first be really appropriate for the dying person to occupy himself with himself instead of with the universal, with this certainty of himself as a “this” instead of with the Truth. We hence here meet with the ordinary point of view but slightly separated from that of the Notion, but, although this is so, this ordinary point of view is far removed from sinking into that coarse conception of the soul which considers it to be a thing, and asks about its continuance or subsistence as if it were a thing. Thus we find Socrates expressing himself to the effect that the body and what relates to the body is a hindrance in striving after wisdom, the sole business of Philosophy, because the sensuous perception shows nothing purely, or as it is in itself, and what is true becomes known through the removal of the spiritual from the corporeal. For justice, beauty and such things are what alone exists in verity; they are that to which all change and decay is foreign; and these are not perceived through the body, but only in the soul.[24]
We see in this separation the essence of the soul not considered in a material category of Being, but as the universal; we see it still more in what follows, by which Plato proves immortality. A principal point in this argument is that already considered, that the soul has existed before this life, because learning is only a recollection,[25] and this implies that the soul is already implicitly what it becomes. We must not think that the bald conception of innate ideas is hereby indicated—such an expression implies the existence of ideas by nature, as though our thoughts were in part already implanted, and had in part a natural existence which did not first produce itself through the movement of the mind. But Plato mainly founds the idea of immortality on the fact that what is put together is liable to dissolution and decay, while the simple can in no manner be dissolved or destroyed; what is always like itself and the same, is, however, simple. The beautiful, the good, the like, being simple, are incapable of all change; that, on the contrary, in which these universals are, men, things, &c., are the changeable. They are perceptible by the senses, while the former is the supersensuous. Hence the soul which is in thought, and which applies itself to this, as to what is related to it, must therefore be held to have itself a simple nature.[26] Here, then, we again see that Plato does not take simplicity as the simplicity of a thing—not as if it were of anything like a chemical ingredient, for example, which can no longer be represented as inherently distinguished; this would only be empty, abstract identity or universality, the simple as an existent.