What we cannot speak about we must pass over in silence.

What is troubling us is the tendency to believe that the mind is like a little man within.

If you tried to doubt everything you would not get as far as doubting anything. The game of doubting itself presupposes certainty.

Philosophy is not a theory but an activity.

My attitude towards him is an attitude towards a soul. I am not of the opinion that he has a soul. . . .

Man has to awaken to wonder - and so perhaps do peoples. Science is a way of sending him to sleep again.

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.