The worst tragedy that could have befallen me was my success. I knew right away that I was through - cast out.

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

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

There is hope in dreams, imagination, and in the courage of those who wish to make those dreams a reality.

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

A good parent gives their child roots and wings.

Now, some people might look at something and let it go by, because they don't recognize the pattern and the significance. It's the sensitivity to pattern recognition that seems to me to be of great importance. It's a matter of being able to find meaning, whether it's positive or negative, in whatever you encounter. It's like a journey. It's like finding the paths that will allow you to go forward, or that path that has a block that tells you to start over again or do something else.