I know that philosophically a murderer is not responsible for his crime, but I prefer not to take tea with him.

The pursuit of truth and beauty is a sphere of activity in which we are permitted to remain children all our lives.

I speak to everyone in the same way, whether he is the garbage man or the president of the university.

A life directed chiefly toward the fulfillment of personal desires will sooner or later always lead to bitter disappointment.

[Kepler] had to realize clearly that logical-mathematical theoretizing, no matter how lucid, could not guarantee truth by itself; that the most beautiful logical theory means nothing in natural science without comparison with the exactest experience. Without this philosophic attitude, his work would not have been possible.

The most important decision we make is whether we believe we live in a friendly or hostile universe.

The fact that man produces a concept "I" besides the totality of his mental and emotional experiences or perceptions does not prove that there must be any specific existence behind such a concept. We are succumbing to illusions produced by our self-created language, without reaching a better understanding of anything. Most of so-called philosophy is due to this kind of fallacy.