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.

Qualities I sought in a scientific theory were naturalness, inner perfection and logical simplicity from an aesthetic approach.

Knowledge of what is does not open the door directly to what should be.

What a sad era when it is easier to smash an atom than a prejudice.

When the Special Theory of Relativity began to germinate in me, I was visited by all sorts of nervous conflicts... I used to go away for weeks in a state of confusion.

Innovation is not the product of logical thought, even though the final product is tied to a logical structure.

Convictions can best be supported with experience and clear thinking.