Those who manage their way into a crisis are not necessarily the right people to manage their way out of a crisis

Since I do not forsee that atomic energy is to be a great boon for a long time, I have to say that for the present it is a menace. Perhaps it is well that it should be. It may intimidate the human race into bringing order into its international affairs, which, without the presence of fear, it would not do.

Not all things worth counting are countable and not all things that count are worth counting.

It has often been said, and certainly not without justification, that the man of science is a poor philosopher.

Conviction is a good motive, but a bad judge.

Assumptions are made and most assumptions are wrong.

Honestly, I cannot understand what people mean when they talk about the freedom of the human will. I have a feeling, for instance, that I will something or other; but what relation this has with freedom I cannot understand at all. I feel that I will to light my pipe and I do it; but how can I connect this up with the idea of freedom? What is behind the act of willing to light the pipe ? Another act of willing?