Never waste jealousy on a real man: it is the imaginary man that supplants us all in the long run.

You are all fundamentalists with a top dressing of science. That is why you are the stupidest of conservatives and reactionists in politics and the most bigoted of obstructionists in science itself. When it comes to getting a move on you are all of the same opinion: stop it, flog it, hang it, dynamite it, stamp it out.

What is really important in Man is the part of him that we do not understand. Of much of it we are not even conscious, just as we are not normally conscious of keeping up our circulation by our heart-pump, though if we neglect it we die.

The more reasonable a student was in mathematics, the more unreasonable she was in the affairs of real life, concerning which fewtrustworthy postulates have yet been ascertained.

When the world goes mad, one must accept madness as sanity; since sanity is, in the last analysis, nothing but the madness on which the whole world happens to agree.

A man thinking or working is always alone, let him be where he will.

When I was young, I observed that nine out of ten things I did were failures. So I did ten times more work.