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

All I know is what I have words for.

Genius is what makes us forget the master's talent.

'Imagine a person whose memory could not retain what the word 'pain' meant-so that he constantly called different things by that name-but nevertheless used the word in a way fitting in with the usual symptoms and presuppositions of pain'-in short he uses it as we all do. Here I should like to say: a wheel that can be turned though nothing else moves with it, is not part of the mechanism.

With my full philosophical rucksack I can only climb slowly up the mountain of mathematics.

Language is a part of our organism and no less complicated than it.

The feeling of an unbridgeable gulf between consciousness and brain-process:When does this feeling occur in the present case?It is when I (for example) turn my attention in a particular way on to my own consciousness, and, astonished, say to myself: THIS is supposed to be produced by a process in the brain!--as it were clutching my forehead.