Homosexuality is regarded as shameful by barbarians and by those who live under despotic governments just as philosophy is regarded as shameful by them, because it is apparently not in the interest of such rulers to have great ideas engendered in their subjects, or powerful friendships or passionate love - all of which homosexuality is particularly apt to produce.
PlatoArithmetic is a kind of knowledge in which the best natures should be trained, and which must not be given up.
PlatoTrue opinions are a fine thing and do all sorts of good so long as they stay in their place; but they will not stay long. They run away from a man's mind, so they are not worth much until you tether them by working out the reason. Once they are tied down, they become knowledge, and are stable.
Plato