If the workers of this world, men and women, decide not to manufacture and transport ammunition, it would end war for all time. We must do that. Dedicate our lives to drying up the source of war; ammunition factories.

The best design is the simplest one that works.

One ought to be ashamed to make use of the wonders of science embodied in a radio set, the while appreciating them as little as a cow appreciates the botanic marvels in the plants she munches.

Striving for social justice is the most valuable thing to do in life.

The pursuit of knowledge is more valuable than its possession.

Berlin is the place to which I am most closely bound by human and scientific ties.

The most important question a person can ask is, "Is the Universe a friendly place?