Phaedrus

Socrates. Such is the life of the gods; but of the other souls, that which best follows after God and is most like him, raises the head of the charioteer up into the outer region and is carried round in the revolution, troubled by the horses and hardly beholding the realities; and another sometimes rises and sometimes sinks, and, because its horses are unruly, it sees some things and fails to see others. The other souls follow after, all yearning for the upper region but unable to reach it, and are carried round beneath, trampling upon and colliding with one another, each striving to pass its neighbor. So there is the greatest confusion and sweat of rivalry, wherein many are lamed, and many wings are broken through the incompetence of the drivers; and after much toil they all go away without gaining a view of reality, and when they have gone away they feed upon opinion. But the reason of the great eagerness to see where the plain of truth is, lies in the fact that the fitting pasturage for the best part of the soul is in the meadow there, and the wing on which the soul is raised up is nourished by this. And this is a law of Destiny, that the soul which follows after God and obtains a view of any of the truths is free from harm until the next period, and if it can always attain this, is always unharmed; but when, through inability to follow, it fails to see, and through some mischance is filled with forgetfulness and evil and grows heavy, and when it has grown heavy, loses its wings and falls to the earth, then it is the law that this soul shall never pass into any beast at its first birth, but the soul that has seen the most shall enter into the birth of a man who is to be a philosopher or a lover of beauty, or one of a musical or loving nature, and the second soul into that of a lawful king or a warlike ruler, and the third into that of a politician or a man of business or a financier, the fourth into that of a hardworking gymnast or one who will be concerned with the cure of the body, and the fifth will lead the life of a prophet or some one who conducts mystic rites; to the sixth, a poet or some other imitative artist will be united, to the seventh, a craftsman or a husbandman, to the eighth, a sophist or a demagogue, to the ninth, a tyrant.