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

Some people feel with their heads and think with their hearts.

Nothing can contribute more to peace of soul than the lack of any opinion whatever.

Before we blame we should first see whether we cannot excuse.

Why does a suppurating lung give so little warning and a sore on the finger so much?

Here take back the stuff that I am, nature, knead it back into the dough of being, make of me a bush, a cloud, whatever you will, even a man, only no longer make me.

Everyone should study at least enough philosophy and belles-lettres to make his sexual experience more delectable.