Revolutions are not made by fate but by men.

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

All science is the search for unity in hidden likenesses.

This is the concentration camp and crematorium at Auschwitz. This is where people were turned into numbers. Into this pond were flushed the ashes of some four million people. And that was not done by gas. It was done by arrogance. It was done by dogma. It was done by ignorance. When people believe that they have absolute knowledge, with no test in reality, this is how they behave.

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

Beyond all our actions stands the larger shadow: How are we to choose between what we have been taught to think right and something else which manifestly succeeds?

Dissent is the mark of freedom.