Nature allows only experimental situations to occur which can be described within the framework of the formalism of quantum mechanics

An expert is someone who knows some of the worst mistakes that can be made in his subject and how to avoid them.

The exact sciences also start from the assumption that in the end it will always be possible to understand nature, even in every new field of experience, but that we may make no a priori assumptions about the meaning of the word understand.

A consistent pursuit of classical physics forces a transformation in the very heart of that physics.

Quantum theory provides us with a striking illustration of the fact that we can fully understand a connection though we can only speak of it in images and parables.

Only a few know, how much one must know to know how little one knows.

I think that modern physics has definitely decided in favor of Plato. In fact the smallest units of matter are not physical objects in the ordinary sense; they are forms, ideas which can be expressed unambiguously only in mathematical language.