The physician, to the extent he is a physician, considers only the good of the patient in what he prescribes, and his own not at all

Geometry draws the soul towards truth.

Poverty doesn't come because of the decrease of wealth but because of the increase of desires.

For all good and evil, whether in the body or in human nature, originates ... in the soul, and overflows from thence, as from the head into the eyes.

Any one who has common sense will remember that the bewilderments of the eyes are of two kinds, and arise from two causes, either from coming out of the light or from going into the light, which is true of the mind's eye, quite as much as of the bodily eye; and he who remembers this when he sees any one whose vision is perplexed and weak, will not be too ready to laugh; he will first ask whether that soul of man has come out of the brighter light, and is unable to see because unaccustomed to the dark, or having turned from darkness to the day is dazzled by excess of light.

We do not learn, and that what we call learning is only a process of recollection.

Athenian men, I respect and love you, but I shall obey the god rather than you.