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

If all the insects were to disappear from the earth, within 50 years all life on earth would end. If all human beings disappeared from the earth, within 50 years all forms of life would flourish.

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

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.

[Who owns the patent on this vaccine?] Well, the people, I would say. There is no patent. Could you patent the sun?

Risks, I like to say, always pay off. You learn what to do, or what not to do.

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

It is always with excitement that I wake up in the morning wondering what my intuition will toss up to me, like gifts from the sea. I work with it and rely on it. It's my partner.

I see the triumph of good over evil as a manifestation of the error-correcting process of evolution.

The most important question we must ask ourselves is, 'Are we being good ancestors?'

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

I would have followed you to hell and back... if only you'd lead me back.

God would never place a dream in your heart that He didn't have the ability to fulfill.

We are never deceived we deceive ourselves.

I cannot emphasize enough the importance of a good teacher.

You basically have to be willing to devote your life to journalism if you want to break in. Treat it like it's medical school or law school.

Jerry Garcia and the Grateful Dead did as much for mankind as any president.

A great deal of thought must be given to your daughter's marriage. Otherwise, she will simply slink off like a cat on a dark night to be fertilized under a bush to God knows whom!

No, the thing is, we all love storytelling, and as a writer you get to tell stories all the time.

It takes a strong character for a person to say, 'I can't do it.

If you do something for fun and create the best possible product, then the profit will come.