Your theory is crazy, but it's not crazy enough to be true.

We are all agreed that your theory is crazy. The question which divides us is whether it is crazy enough to have a chance of being correct. My own feeling is that it is not crazy enough.

Be bold, be brave enough to be your true self.

Every description of natural processes must be based on ideas which have been introduced and defined by the classical theory.

Be true to your work, your word, and your friend.

While the finish given to our picture of the world by the theory of relativity has already been absorbed into the general scientific consciousness, this has scarcely occurred to the same extent with those aspects of the general problem of knowledge which have been elucidated by the quantum theory.