Shall we not, then, lay down a law, in the first place, that boys shall abstain altogether from wine till their eighteenth year, thereby teaching that it is wrong to add fire to fire, as through a funnel, pouring it into their body and soul before they proceed to the labor of life, thus exercising a caution as to the maddening habits of youth.

Love is the pursuit of the whole.

Don't quarrel with your parents even if you are on the right.

There is a ... matter - much more valuable and divine than natural philosophy . ... On this matter I must speak to you in enigmas.

I have hardly ever known a mathematician who was capable of reasoning.

Love is a madness produced by an unsatisfiable rational desire to understand the ultimate truth about the world.

One cannot make a slave of a free person, for a free person is free even in a prison.