No man should bring children into the world who is unwilling to persevere to the end in their nature and education.

Man is the plumeless genus of bipeds, birds are the plumed.

Knowledge is the rediscovering of our own insight.

Only a philosopher's mind grows wings, since its memory always keeps it as close as possible to those realities by being close to which the gods are divine.

God is a geometrician.

And tell him it's quite true that the best of the philosophers are of no use to their fellows; but that he should blame, not the philosophers, but those who fail to make use of them.

Wonder is the beginning of the desire to know the beautiful and the good.