Weak people revenge. Strong people forgive. Intelligent People Ignore.

Freedom of teaching and of opinion in book or press is the foundation for the sound and natural development of any people.

Innovation is everyones responsibility, not just R&Ds.

What good is a reputation not put to good use.

How vile and despicable war seems to me! I would rather be hacked to pieces than take part in such an abominable business.

The relativity principle in connection with the basic Maxwellian equations demands that the mass should be a direct measure of the energy contained in a body; light transfers mass. With radium there should be a noticeable diminution of mass. The idea is amusing and enticing; but whether the Almighty is laughing at it and is leading me up the garden path -- that I cannot know.

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.