Phaedrus

Socrates. Now the great leader in heaven, Zeus, driving a winged chariot, goes first, arranging all things and caring for all things. He is followed by an army of gods and spirits, arrayed in eleven squadrons; Hestia alone remains in the house of the gods. Of the rest, those who are included among the twelve great gods and are accounted leaders, are assigned each to his place in the army. There are many blessed sights and many ways hither and thither within the heaven, along which the blessed gods go to and fro attending each to his own duties; and whoever wishes, and is able, follows, for jealousy is excluded from the celestial band. But when they go to a feast and a banquet, they proceed steeply upward to the top of the vault of heaven, where the chariots of the gods, whose well matched horses obey the rein, advance easily, but the others with difficulty; for the horse of evil nature weighs the chariot down, making it heavy and pulling toward the earth the charioteer whose horse is not well trained. There the utmost toil and struggle await the soul. For those that are called immortal, when they reach the top, pass outside and take their place on the outer surface of the heaven, and when they have taken their stand, the revolution carries them round and they behold the things outside of the heaven. But the region above the heaven was never worthily sung by any earthly poet, nor will it ever be. It is, however, as I shall tell; for I must dare to speak the truth, especially as truth is my theme. For the colorless, formless, and intangible truly existing essence, with which all true knowledge is concerned, holds this region and is visible only to the mind, the pilot of the soul. Now the divine intelligence, since it is nurtured on mind and pure knowledge, and the intelligence of every soul which is capable of receiving that which befits it, rejoices in seeing reality for a space of time and by gazing upon truth is nourished and made happy until the revolution brings it again to the same place. In the revolution it beholds absolute justice, temperance, and knowledge, not such knowledge as has a beginning and varies as it is associated with one or another of the things we call realities, but that which abides in the real eternal absolute; and in the same way it beholds and feeds upon the other eternal verities, after which, passing down again within the heaven, it goes home, and there the charioteer puts up the horses at the manger and feeds them with ambrosia and then gives them nectar to drink.