A great thought begins by seeing something differently, with a shift of the mind's eye.

I believe that we don't need to worry about what happens after this life, as long as we do our duty here-to love and to serve.

When I have one week to solve a seemingly impossible problem, I spend six days defining the problem. Then, the solution becomes obvious.

The most beautiful experience in the world is the experience of the mysterious.

The satisfaction of physical needs is indeed the indispensable pre-condition of a satisfactory existence, but in itself it is not enough. In order to be content, men must also have the possibility of developing their intellectual and artistic powers to whatever extent accords with their personal characteristics and abilities.

Since the mathematicians have invaded the theory of relativity I do not understand it myself any more.

I never allow myself to become discouraged under any circumstances. The three great essentials to achieve anything worthwhile are first, hard work, second, stick-to-ittiveness, third, common sense.