You must always be puzzled by mental illness. The thing I would dread most, if I became mentally ill, would be your adopting a common sense attitude; that you could take it for granted that I was deluded.

It would strike me as ridiculous to want to doubt the existence of Napoleon; but if someone doubted the existence of the earth 150years ago, perhaps I should be more willing to listen, for now he is doubting our whole system of evidence.

The solution to the problem of life is seen in the vanishing of this problem.

He who lives in the present lives in eternity.

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

Philosophy is a battle against the bewitchment of our intelligence by means of language.

What can be shown, cannot be said.