Albert Einstein

The true sign of intelligence is not knowledge but imagination.

If A equals success, then the formula is A equals X plus Y and Z, with X being work, Y play, and Z keeping your mouth shut.

It is the supreme art of the teacher to awaken joy in creative expression and knowledge.

Science without religion is lame, religion without science is blind.

Two things are infinite: the universe and human stupidity; and I'm not sure about the universe.

Imagination is more important than knowledge. For knowledge is limited to all we now know and understand, while imagination embraces the entire world, and all there ever will be to know and understand.

As far as the laws of mathematics refer to reality, they are not certain, and as far as they are certain, they do not refer to reality.

Only a life lived in the service to others is worth living.

It's not that I'm so smart, it's just that I stay with problems longer.

Things should be made as simple as possible, but not any simpler.