All the fifty years of conscious brooding have brought me no closer to answer the question, "What are light quanta?" Of course today every rascal thinks he knows the answer, but he is deluding himself.

After a certain high level of technical skill is achieved science and art tend to coalesce in aesthetics, plasticity, and form. The greatest scientists are artists as well.

Everything has changed, except our way of thinking.

In theory, theory and practice are the same. In practice, they are not.

I do not believe in the God of theology who rewards good and punishes evil.

If one tries to navigate unknown waters one runs the risk of shipwreck

It takes a different kind of thinking to solve a problem than the kind of thinking which produced the problem.