Any intelligent fool can make things bigger, more complex, and more violent. It takes a touch of genius -- and a lot of courage -- to move in the opposite direction.

The intuitive mind is a sacred gift and the rational mind is a faithful servant. We have created a society that honors the servant and has forgotten the gift.

Fear and stupidity has always been the basis of most human actions.

Physical concepts are free creations of the human mind, and are not, however it may seem, uniquely determined by the external world.

The most beautiful thing we experience is the mysterious. It is the source of all art and science.

As far as the laws of mathematics refer to reality, they are not certain; and as far as they are certain, they do not refer to reality.

Ethical axioms are found and tested not very differently from the axioms of science. Truth is what stands the test of experience.

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

There are only two ways to live your life. One is as though nothing is a miracle. The other is as though everything is a miracle.

The distinction between past, present and future is only an illusion, even if a stubborn one.