We may know ourselves, and yet even with all the efforts we make, we do not know ourselves. We know our fellowman, and yet we do not know him, because we are not a thing, and our fellowman is not a thing. The further we reach into the depths of our being, on someone else's being, the more the goal of knowledge eludes us.

Sleep is often the only occasion in which man cannot silence his conscience; we forget what we knew in our dream.

If faith cannot be reconciled with rational thinking, it has to be eliminated as an anachronistic remnant of earlier stages of culture and replaced by science dealing with facts and theories which are intelligible and can be validated.

[Carl Gustav] Jung was not right when he said that the unconscious message is always written clearly and so there is no need to seek to discover the distortions, because one must recognize that many dreams are more or less distortions.

Man is born as a freak of nature, being within nature and yet transcending it. He has to find principles of action and decision-making which replace the principles of instincts.

If the Russians claim they are Socialist, this is just, I would say, a lie. They have no socialism at all. They have what I would call a state capitalism.

The capacity to be puzzled is the premise of all creation, be it in art or in science.