Common sense is the collection of prejudices acquired by age eighteen.

I believe my theory of relativity to be true. But it will only be proved for certain in 1981, when I am dead.

It takes a different kind of thinking to solve a problem than the kind of thinking which produced the problem.

Where the world ceases to be the scene of our personal hopes and wishes, where we face it as free beings admiring, asking and observing, there we enter the realm of Art and Science.

The world we have made is a result of the level of thinking we have done thus far.

The only mistake in life is the lesson not learned.

The idea of a personal God is quite alien to me and seems even naïve.