I feel that the greatest reward for doing is the opportunity to do more.

What people think of as the moment of discovery is really the discovery of the question.

When you inoculate children with a polio vaccine, you don't sleep well for two or three months.

Nothing happens quite by chance. It's a question of accretion of information and experience.

Good parents give their children Roots and Wings. Roots to know where home is, wings to fly away and exercise what's been taught them.

My ambition was to bring to bear on medicine a chemical approach. I did that by chemical manipulation of viruses and chemical ways of thinking in biomedical research.

Life is an error-making and an error-correcting process.