One of the absolute rules I learned in the war was, don’t know anything you don’t need to know, because if you ever get caught they will get it out of you.

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

One of the things I learned, one of the strangest things, is how to think. There was nothing else to do. I couldn’t see people, or go for a walk in the forest. All I had was my head and my books, and I thought a lot.

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.

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

To make a discovery is not necessarily the same as to understand a discovery. Not only Planck but also other physicists were intially at a loss as to what the proper context of the new postulate really was.

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

[George] Uhlenbeck was a highly gifted physicist. One of his remarkable traits was he would read every issue of T%he Physical Review from cover to cover.

There is not a soul on Earth who can read the deluge of physics publications in its entirety. As a result, it is sad but true that physics has irretrievably fallen apart from a cohesive to a fragmented discipline. ... It was not that long ago that people were complaining about two cultures. If we only had it that good. today.