A man is rich in proportion to the number of things he can afford to let alone.
We have heard much about the poetry of mathematics, but very little of it has yet been sung. The ancients had a juster notion of their poetic value than we.
Enthusiasm is a supernatural serenity.
A simple and independent mind does not toil at the bidding of any prince.
Rather than love, than money, than fame, give me truth.
Who hears the fishes when they cry?