A life directed chiefly toward the fulfillment of personal desires will sooner or later always lead to bitter disappointment.

If one day you have to choose between the world and love, remember this: If you choose the world you’ll be left without love, but if you choose love, with it you will conquer the world

The American lives even more for his goals, for the future, than the European. Life for him is always becoming, never being.

There lies the weaknesss of positivists and professional atheists who are elated because they feel that they have not only successfully rid the world of gods but "bared the miracles." (That is, explained the miracles. - ed.) Oddly enough, we must be satisfied to acknowledge the "miracle" without there being any legitimate way for us to approach it . I am forced to add that just to keep you from thinking that -weakened by age-I have fallen prey to the clergy.

The special theory of relativity owes its origins to Maxwell's equations of the electromagnetic field.

I find it difficult to believe that I belong to such an idiotic, rotten species - the species that actually boasts of its freedom of will, heroism on command, senseless violence, and all of the loathsome nonsense that goes by the name of patriotism.

You teach me baseball and I'll teach you relativity...No we must not. You will learn about relativity faster than I learn baseball.