We feel that even if all possible scientific questions be answered, the problems of life have still not been touched at all.

A right-hand glove could be put on the left hand if it could be turned round in four-dimensional space.

A philosopher who is not taking part in discussions is like a boxer who never goes into the ring

Not how the world is, but that it is, is the mystery.

I am sitting with a philosopher in the garden; he says again and again 'I know that that’s a tree', pointing to a tree that is near us. Someone else arrives and hears this, and I tell him: 'This fellow isn’t insane. We are only doing philosophy.

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.