I always tried to live up to Leo Szilard's commandment, "don't lie if you don't have to." I had to. I filled up pages with words and plans I knew I would not follow. When I go home from my laboratory in the late afternoon, I often do not know what I am going to do the next day. I expect to think that up during the night. How could I tell them what I would do a year hence?

Discovery consists of looking at the same thing as everyone else and thinking something different.

A substance that makes you ill if you don't eat it.

Knowledge is a sacred cow, and my problem will be how we can milk her while keeping clear of her horns.

Think boldly. Don't be afraid of making mistakes. Don't miss small details, keep your eyes open and be modest in everything except your aims.

The American Cancer Society tried to ruin my research foundation.

To regulate something always requires two opposing factors. You cannot regulate by a single factor. To give an example, the traffic in the streets could not be controlled by a green light or a red light alone. It needs a green light and a red light as well. The ratio between retine and promine determines whether there is any motion, any growth, or not. Two different inclinations have to be there in readiness to make the cells proliferate.