The destiny of man is not measured by material computations. When great forces are on the move in the world, we learn we’re spirits—not animals…. There’s something going on in time and space, and beyond time and space, which, whether we like it or not, spells duty.

To each there comes in their lifetime a special moment when they are figuratively tapped on the shoulder and offered the chance to do a very special thing, unique to them and fitted to their talents. What a tragedy if that moment finds them unprepared or unqualified for that which could have been their finest hour.

I'm finished ... I'm done. What I want above all things is to take some active part in beating the Germans ... I'd go out to the Front at once.

I did not like the man [Niels Bohr] when you showed him to me, with his hair all overhis head.

Old men make war, young men fight and die

The price of greatness is responsibility.

Writing a book is an adventure.