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.

Brevity: To say at once whatever is to be said.

The most successful tempters and thus the most dangerous are the deluded deluders.

I believe that man is in the last resort so free a being that his right to be what he believes himself to be cannot be contested.

A schoolteacher or professor cannot educate individuals, he educates only species.

He was always smoothing and polishing himself, and in the end he became blunt before he was sharp.

Do not say hypothesis, and even less theory: say way of thinking.