I speak to everyone in the same way, whether he is the garbage man or the president of the university.

Everything should be made as simple as possible, but no simpler.

The release of atomic energy has not created a new problem. It has merely made more urgent the necessity of solving an existing one.

The definition of genius is taking the complex and making it simple.

The important things are always simple.

God always takes the simplest way.

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

Any man who can drive safely while kissing a pretty girl is simply not giving the kiss the attention it deserves.

An empty stomach is not a good political adviser.

Nature rarely surrenders one of her magnificent secrets.

A little knowledge is a dangerous thing. So is a lot.

No amount of experimentation can ever prove me right; a single experiment can prove me wrong.

That deep emotional conviction of the presence of a superior reasoning power, which is revealed in the incomprehensible universe, forms my idea of God.

True art is characterized by an irresistible urge in the creative artist.

Conscious man, to be sure, has at all times been keenly aware that life is an adventure, that life must, forever, be wrested from death.

Love is a better master than duty.

Any fool can know. The point is to understand.

If you can't explain it to a six year old, you don't understand it yourself.

Weak people revenge. Strong people forgive. Intelligent people ignore.

Strive not to be a success, but rather to be of value.