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

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

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

Even truth needs to be clad in new garments if it is to appeal to a new age.

Doubt everything at least once, even the sentence "Two times two is four."

Deliberate virtue is never worth much: The virtue of feeling or habit is the thing.

A donkey appears to me like a horse translated into Dutch.