Love is not the stupidest thing a man does, but it cannot be blamed on gravity.

Science will stagnate if it is made to serve practical goals.

If you want to live a happy life, tie it to a goal, not to people or objects.

Except in mathematics, the shortest distance between point A and point B is seldom a straight line. I don't believe in mathematics.

Whatever your problems in math are, I assure mine are greater.

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 urge a willingness to reserve a place in rational science for non-rational wonder.