Knowledge is in the end based on acknowledgement.

A man's thinking goes on within his consciousness in a seclusion in comparison with which any physical seclusion is an exhibition to public view.

It is so characteristic, that just when the mechanics of reproduction are so vastly improved, there are fewer and fewer people who know how the music should be played.

A man will be imprisoned in a room with a door that's unlocked and opens inwards; as long as it does not occur to him to pull rather than push.

A new word is like a fresh seed sown on the ground of the discussion.

A picture is a fact.

A serious and good philosophical work could be written consisting entirely of jokes.

Death is not an event in life: we do not live to experience death. If we take eternity to mean not infinite temporal duration but timelessness, then eternal life belongs to those who live in the present.

Don't get involved in partial problems, but always take flight to where there is a free view over the whole single great problem, even if this view is still not a clear one.

For a truly religious man nothing is tragic.

Humor is not a mood but a way of looking at the world. So if it is correct to say that humor was stamped out in Nazi Germany, that does not mean that people were not in good spirits, or anything of that sort, but something much deeper and more important.

Logic takes care of itself; all we have to do is to look and see how it does it.

A confession has to be part of your new life.

I don't know why we are here, but I'm pretty sure that it is not in order to enjoy ourselves.

Logic must look after itself. In a certain sense, we cannot make mistakes in logic.