Politics is a pendulum whose swings between anarchy and tyranny are fueled by perennially rejuvenated illusions.

I believe, indeed, that overemphasis on the purely intellectual attitude, often directed solely to the practical and factual, in our education, has led directly to the impairment of ethical values.

The ordinary adult never gives a thought to space-time problems ... I, on the contrary, developed so slowly that I did not begin to wonder about space and time until I was an adult. I then delved more deeply into the problem than any other adult or child would have done.

Do not worry about your difficulties in Mathematics. I can assure you mine are still greater.

The number of natural hypothesis that can explain any given phenomena is infinite.

I like to think the moon is there even if I am not looking at it.

Only six men in the world know about relativity. I am not one of them. When I ask them to explain, they confused me.