To make a discovery is not necessarily the same as to understand a discovery.

Deliberately or not, every author is of course present in every book he or she writes - even in a scientific text.

I spent every night until four in the morning on my dissertation, until I came to the point when I could not write another word, not even the next letter. I went to bed. Eight o'clock the next morning I was up writing again.

I knew all the time I was going to get through the war. It was completely irrational, a silly idea, but I was not going to lie down and get myself killed. I was going to get out of it.

A number of current theoretical explorations will turn out to be passing fancies...

[Heisenberg's seminal 1925 paper initiating quantum mechanics marked] one of the great jumps—perhaps the greatest—in the development of twentieth century physics.

To make a discovery is not necessarily the same as to understand a discovery.