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

All means prove but blunt instruments, if they have not behind them a living spirit.

I know quite certainly that I myself have no special talent; curiosity, obsession and dogged endurance, combined with self-criticism, have brought me to my ideas.

Not until we dare to regard ourselves as a nation, not until we respect ourselves, can we gain the esteem of others, or rather only then will it come of its own accord

The highest principles for our aspirations and judgments are given to us in the Jewish-Christian religious tradition.

Without the sense of fellowship with men of like mind... life would have seemed to me empty.

The human mind has first to construct forms, independently, before we can find them in things.