Be a voice not an echo.

How insidious Nature is when one is trying to get at it experimentally.

Try first to be a man of value; success will follow.

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.

Body and soul are not two different things, but only two different ways of perceiving the same thing. Similarly, physics and psychology are only different attempts to link our experiences together by way of systematic thought.

Mathematics are well and good but Nature keeps dragging us around by the nose.

Imagination Is More Powerful Than Knowledge Because Knowledhe Is Limited But Imagination Is Without Boundaries