There two things that are infinite, human stupidity and the universe, I don't know about the universe

For me the Jewish religion like all other religions is an incarnation of the most childish superstitions.

It should be possible to explain the laws of physics to a barmaid.

Classical thermodynamics ... is the only physical theory of universal content which I am convinced ... will never be overthrown.

Man like every other animal is by nature indolent. If nothing spurs him on, then he will hardly think, and will behave from habit like an automaton.

Long hair minimizes the need for barbers; socks can be done without; one leather jacket solves the coat problem for many years; suspenders are superfluous.

Violence sometimes may have cleared away obstructions quickly, but it never has proved itself creative.