If one studies too zealously, one easily loses his pants.

Do not grow old, no matter how long you live. Never cease to stand like curious children before the Great Mystery into which we were born.

All such action would cease if those powerful elemental forces were to cease stirring within us.

I must seem like an ostrich who forever burries its head in the relativistic sands in order not to face the evil quanta.

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.

I don't believe in mathematics.

Yes, we now have to divide up our time like that, between politics and our equations. But to me our equations are far more important, for politics are only a matter of present concern. A mathematical equation stands forever.