The doctrine (of) maintaining that the language of daily life, with words used in their ordinary meanings, suffices for philosophy . . . I find myself totally unable to accept . . . . Because it makes almost inevitable the perpetuation amongst philosophers of the muddle-headedness they have taken over from common sense.

The greatest challenge to any thinker is stating the problem in a way that will allow a solution.

The fact that all Mathematics is Symbolic Logic is one of the greatest discoveries of our age; and when this fact has been established, the remainder of the principles of mathematics consists of the analysis of Symbolic Logic itself.

To the primitive mind, everything is either friendly or hostile; but experience has shown that friendliness and hostility are not the conceptions by which the world is to be understood.

If we were all given by magic the power to read each other's thoughts, I suppose the first effect would be to dissolve all friendships.

Be isolated, be ignored, be attacked, be in doubt, be frightened, but do not be silenced.

What the world needs is not dogma but an attitude of scientific inquiry.