The most beautiful thing we can experience is the mysterious. It is the source of all true art and science.

Epistemology without contact with science becomes an empty scheme. Science without epistemology is-insofar as it is thinkable at all-primitive and muddled.

An autocratic system of coercion, in my opinion, soon degenerates. For force always attracts men of low morality, and I believe it to be an invariable rule that tyrants of genius are succeeded by scoundrels. For this reason I have always been passionately opposed to systems such as we see in Italy and Russia to-day.

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

The best design is the simplest one that works.

Life is like a bicycle; keep moving on to maintain balance.

The bigotry of the nonbeliever is for me nearly as funny as the bigotry of the believer.