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

Maybe everyone can live beyond what they're capable of.

I guess that’s the beauty of books. When they finish they don’t really finish.

The injury of words. Yes, the brutality of words.

It's not a big thing, but I guess it's true--big things are often just small things that are noticed.

I have to say that although it broke my heart, I was, and still am, glad I was there.

Like most misery, it started with apparent happiness.

Reply when questioned on the safety of the polio vaccine he developed: It is safe, and you can't get safer than safe.

If humankind would accept and acknowledge this responsibility and become creatively engaged in the process of evolution, consciously as well as unconsciously, a new reality would emerge, and a new age could be born.

The art of science is as important as so-called technical science. You need both. It's this combination that must be recognized and acknowledged and valued.

My job is to help people see what I see. If it's of value, fine. And, if it's not of value, then at least I've done what I can do.

Intuition will tell the thinking mind where to look next.

A good parent gives their child roots and wings.

I have had dreams and I have had nightmares, but I have conquered my nightmares because of my dreams.

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.

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

Are we being good ancestors?

I pictured myself as a virus or a cancer cell and tried to sense what it would be like.

It is courage based on confidence, not daring, and it is confidence based on experience.