“I am not interested in constructing a building, so much as in having a perspicuous view of the foundations of possible buildings.”

“Nothing is more important for teaching us to understand the concepts we have than to construct fictitious ones.”

“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.”

“Language disguises the thought; so that from the external form of the clothes one cannot infer the form of the thought they clothe, because the external form of the clothes is constructed with quite another object than to let the form of the body be recognized.”

“I think one of the things you and I have to learn is that we have to live without the consolation of belonging to a Church....Of one thing I am certain. The religion of the future will have to be extremely ascetic, and by that I don't mean just going without food and drink.”

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

“I am my world.”