Mathematics is a logical method. . . . Mathematical propositions express no thoughts. In life it is never a mathematical proposition which we need, but we use mathematical propositions only in order to infer from propositions which do not belong to mathematics to others which equally do not belong to mathematics.

It is an hypothesis that the sun will rise tomorrow: and this means that we do not know whether it will rise.

One cannot guess how a word functions. One has to look at its use and learn from that. But the difficulty is to remove the prejudice which stands in the way of doing this. It is not a stupid prejudice.

The real discovery is the one which enables me to stop doing philosophy when I want to. The one that gives philosophy peace, so that it is no longer tormented by questions which bring itself into question.

The solution to the problem of life is seen in the vanishing of this problem.

Don't think, but look! (PI 66)

One is unable to notice something because it is always before one's eyes.