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

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

“Whereof one cannot speak, thereof one must be silent.”

“The real question of life after death isn't whether or not it exists, but even if it does what problem this really solves.”

“I am my world.”

“I am sitting with a philosopher in the garden; he says again and again 'I know that thats a tree', pointing to a tree that is near us. Someone else arrives and hears this, and I tell him: 'This fel...”

“Skepticism is thus a resting-place for human reason, where it can reflect upon its dogmatic wanderings and make survey of the region in which it finds itself, so that for the future it may be able ...”

“Whenever a theory appears to you as the only possible one, take this as a sign that you have neither understood the theory nor the problem which it was intended to solve.”

“All the systems which explain so precisely why the world is as it is and why it can never be otherwise, have always called forth in me the same kind of uneasiness one has when face to face with the...”

“I do not know what I may appear to the world, but to myself I seem to have been only like a boy playing on the sea-shore, and diverting myself in now and then finding a smoother pebble or a prettie...”

“To know the history of science is to recognize the mortality of any claim to universal truth. ”

“The scientist only imposes two things, namely truth and sincerity, imposes them upon himself and upon other scientists.”