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

When I worked on the polio vaccine, I had a theory. I guided each [experiment] by imagining myself in the phenomenon in which I was interested. The intuitive realm . . . the realm of the imagination guides my thinking.

Your dreams tell you what to do; your reason tells you how to do it.

It is said to await certainty is to await eternity.

One of the greatest rewards for doing can be the chances it gives to do some more - even better.

My life is pretty well at peace, and the profession is more of an avocation. It's a calling, if you like, rather than a job. I do what I feel impelled to do, as an artist would.

The people - could you patent the sun ?