Anyone who has begun to think places some portion of the world in jeopardy.

Complete adaptation to environment means death. The essential point in all response is the desire to control environment.

Education is not a preparation for life; education is life itself.

Every great advance in science has issued from a new audacity of imagination.

Luck, bad if not good, will always be with us. But it has a way of favoring the intelligent and showing its back to the stupid.

Man is not logical and his intellectual history is a record of mental reserves and compromises. He hangs on to what he can in his old beliefs even when he is compelled to surren ...

Skepticism: the mark and even the pose of the educated mind.

the conviction persists - though history has shown it to be a hallucination - that all the questions that the human mind has asked are questions that can be answered in terms of ...

The good man is the man who, no matter how morally unworthy he has been, is moving to become better.

The path of least resistance and least trouble is a mental rut already made. It requires troublesome work to undertake the alternation of old beliefs. Self-conceit often regards ...