Much reading has brought upon us a learned barbarism.

A man of spirit must not think of the word difficulty as so much as existing. Away with it!

Non cogitant, ergo non sunt.

Great men too make mistakes, and many among them do it so often that one is almost tempted to call them little men.

Ambition and suspicion always go together.

We have no words for speaking of wisdom to the stupid. He who understands the wise is wise already.

Delight at having understood a very abstract and obscure system leads most people to believe in the truth of what it demonstrates.