“Just be indipendent of the external world, so you don't have to fear for what's in it.”

“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.”

“There are two godheads: the world and my independent I. I am either happy or unhappy, that is all. It can be said: good or evil do not exist. A man who is happy must have no fear. Not even in the face of death. Only a man who lives not in time but in the present is happy.”

“What stands fast does so, not because it is intrinsically obvious or convincing; it is rather held fast by what lies around it.”

“[Philosophy] must set limits to what can be thought; and, in doing so, to what cannot be thought. It must set limits to what cannot be thought by working outwards through what can be thought.”

“If a blind man were to ask me “Have you got two hands?” I should not make sure by looking. If I were to have any doubt of it, then I don’t know why I should trust my eyes. For why shouldn’t I test my eyes by looking to find out whether I see my two hands? What is to be tested by what?”