All mathematics is tautology.

Philosophy is like trying to open a safe with a combination lock: each little adjustment of the dials seems to achieve nothing, only when everything is in place does the door open.

My attitude towards him is an attitude towards a soul. I am not of the opinion that he has a soul. . . .

If I have exhausted the justifications, I have reached bedrock and my spade is turned. Then I am inclined to say: 'This is simply what I do.

Where our language suggests a body and there is none: there, we should like to say, is a spirit.

To think that you are not following a rule is to follow a rule.

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.