Thinking is the soul talking to itself.

But of the heaven which is above the heavens, what earthly poet ever did or ever will sing worthily?

No trace of slavery ought to mix with the studies of the freeborn man. No study, pursued under compulsion, remains rooted in the memory.

Thus rhetoric, it seems, is a producer of persuasion for belief, not for instruction in the matter of right and wrong ... And so the rhetorician's business is not to instruct a law court or a public meeting in matters of right and wrong, but only to make them believe.

Every heart sings a song, incomplete, until another heart whispers back.

But at three, four, five, and even six years the childish nature will require sports; now is the time to get rid of self-will in him, punishing him, but not so as to disgrace him.

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