Intelligence is not the ability to store information, but to know where to find it.

We can understand almost anything, but we can't understand how we understand.

The comprehensibility of the world seems to me a wonder or eternal secret. Here lies the sense of wonder which increases even more with the development of our knowledge.

The most superior of scientific goals is to embrace a maximum of experiment with a minimum of hypotheses.

On the left-hand side of the field equation we may add the fundamental tensor guv, multiplied by a universal constant, -λ, at present unknown, without destroying the general covariance.

Money only appeals to selfishness and always tempts its owners irresistibly to abuse it. Can anyone imagine Moses, Jesus, or Gandhi armed with the money-bags of Carnegie?

All that is valuable in human society depends upon the opportunity for development accorded the individual.