The symbol and the metaphor are as necessary to science as to poetry.

Nations in their great ages have not been great in art or science, but in art and science.

Revolutions are not made by fate but by men.

Whether our work is art or science or the daily work of society, it is only the form in which we explore our experience which is different.

The idea that the universe is running down comes from a simple observation about machines. Every machine consumes more energy than it renders.

There are three creative ideas which, each in its turn, have been central to science. They are the idea of order, the idea of causes, and the idea of chance.

Power is the by-product of understanding.