Nowadays three witty turns of phrase and a lie make a writer.

Pain warns us not to exert our limbs to the point of breaking them. How much knowledge would we not need to recognize this by the exercise of mere reason.

Ambition and suspicion always go together.

We are obliged to regard many of our original minds as crazy at least until we have become as clever as they are.

Nothing puts a greater obstacle in the way of the progress of knowledge than thinking that one knows what one does not yet know.

When an acquaintance goes by I often step back from my window, not so much to spare him the effort of acknowledging me as to spare myself the embarrassment of seeing that he has not done so.

A sure sign of a good book is that you like it more the older you get.