Without the sense of fellowship with men of like mind... life would have seemed to me empty.

Laws alone can not secure freedom of expression; in order that every man present his views without penalty there must be spirit of tolerance in the entire population.

My interest in science was always essentially limited to the study of principles.... That I have published so little is due to this same circumstance, as the great need to grasp principles has caused me to spend most of my time on fruitless pursuits.

Thanks to my fortunate idea of introducing the relativity principle into physics, you (and others) now enormously overrate my scientific abilities, to the point where this makes me quite uncomfortable.

To the extent math refers to reality, we are not certain to the extent we are certain, math does not refer to reality.

When you are courting a nice girl an hour seems like a second.

All that's different about me is that I still ask the questions most people stopped asking at age five.