A great power imposes the obligation of exercising restraint, and we did not live up to this obligation. I think this affected many of the scientists… - Leó Szilárd

It is not necessary to succeed in order to persevere. As long as there is a margin of hope, however narrow, we have no choice but to base all our actions on that margin. America and Russia have one interest in common which may override all their other interests: to be able to live with the bomb without getting into an all-out war that neither of them wants.

In order to succeed it is not necessary to be much cleverer than other people. All you have to do is be one day ahead of them.

In life you must often choose between getting a job done or getting credit for it. In science, the most important thing is not the ideas you have but the decision which ones you choose to pursue. If you have an idea and are not doing anything with it, why spoil someone else's fun by publishing it?