The mere formulation of a problem is far more essential than its solution, which may be merely a matter of mathematical or experimental skills. To raise new questions, new possibilities, to regard old problems from a new angle requires creative imagination and marks real advances in science.

The pioneers of a warless world are the young men (and women) who refuse military service.

There is an atmosphere of well-sounding oratory that likes to attach itself to dress clothes. Away with it!

I no longer believed in the known God of the Bible, but rather in the mysterious God expressed in nature.

The belief in an external world independent of the perceiving subject is the basis of all natural science. Since, however, sense perception only gives information of this external world or of "physical reality" indirectly, we can only grasp the latter by speculative means. It follows from this that our notions of physical reality can never be final. We must always be ready to change these notions - that is to say, the axiomatic basis of physics - in order to do justice to perceived facts in the most perfect way.

You can never solve a problem with the same kind of thinking that created the problem in the first place.

Man can find meaning in life only through devoting himself to society.