Life with a scientist who is often changing jobs and is frequently away at meetings and on lecture tours is not easy. Without a secure home base, I could not have made much progress.

Looking through the list of earlier Nobel laureates, I note a large number with whom I became acquainted and with whom I interacted during those years as they passed through Cambridge.

I was a close observer of the developments in molecular biology.

At the age of 12, I developed an intense interest in mathematics. On exposure to algebra, I was fascinated by simultaneous equations and read ahead of the class to the end of the book.

From an early age I was told that I was expected to do more than continue to run a small business. Education was important and seen as a way of moving forward.

I am delighted to have had students, friends and colleagues in so many nations and to have learned so much of what I know from them. This Nobel Award honours them all.

On my return to Pittsburgh, I resolved to go back to the fundamental problems of electronic structure that I had contemplated abstractly many years earlier.

Leaving England was a painful decision, and we still have some regrets about it. However, at that time, the research environment for theoretical chemistry was clearly better in the U.S.

I had changed from being a mathematician to a practicing scientist. I was increasingly embarassed that I could no longer follow some of the more modern branches of pure mathematics.

In the war, most young men were inducted into the armed forces at the age of 17. A group of students was permitted to attend university before taking part in wartime research projects.

Our children were mostly brought up and educated in the Churchill suburb east of Pittsburgh. Each summer, we took them back to England for an extended period.

It is better to be than belong.

The book-learned preacher who carries the badge of authority, is by no means religious.

Neither Goyl nor men lived long enough to understand that yesterday was born of tomorrow, just as tomorrow was born of yesterday.

The devil on my right shoulder must have brutally strangled the angel on my left.

The public want actresses, because they think all actresses bad. They don't want music or poetry because they know that both are good. So actors and actresses thrive and poets and composers starve.

My life is a rather grim one. One day I shall perhaps describe it to you in great detail.

Average is the enemy of excellence, and average commitment will prevent you from enduring to the end.

Humane science must be adapted to the requirements of a balanced and rewarding life.

I love being part of an ensemble.

I still get crazy once in a while, but just less crazy.