Time is an illusion.

Physics is essentially an intuitive and concrete science. Mathematics is only a means for expressing the laws that govern phenomena.

Where there is love, there is no imposition.

Science will stagnate if it is made to serve practical goals.

During the last century, and part of the one before, it was widely held that there was an unreconcilable conflict between knowledge and belief.

When the Special Theory of Relativity began to germinate in me, I was visited by all sorts of nervous conflicts... I used to go away for weeks in a state of confusion.

I think and think for months and years. Ninety-nine times, the conclusion is false. The hundredth time I am right.