that that which moves itself is nothing else than the soul,—then the soul would necessarily be ungenerated and immortal. Concerning the immortality of the soul this is enough; but about its form we must speak in the following manner. To tell what it really is would be a matter for utterly superhuman and long discourse, but it is within human power to describe it briefly in a figure; let us therefore speak in that way. We will liken the soul to the composite nature of a pair of winged horses and a charioteer. Now the horses and charioteers of the gods are all good and