Some people are constructive, if you like. Others are destructive. It’s this diversity in humankind that results in some making positive contributions and some negative contributions. It’s necessary to have enough to make positive contributions to overcome the problems of each age.
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.
Life is an error-making and an error-correcting process.
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.
Eventually we’ll realize that if we destroy the ecosystem, we destroy ourselves.
There is hope in dreams, imagination, and in the courage of those who wish to make those dreams a reality.
I have had dreams and I have had nightmares, but I have conquered my nightmares because of my dreams.
I feel that the greatest reward for doing is the opportunity to do more.
Your dreams tell you what to do; your reason tells you how to do it.
Risks, I like to say, always pay off. You learn what to do, or what not to do.
The most important question we must ask ourselves is, ‘Are we being good ancestors?’
Reply when questioned on the safety of the polio vaccine he developed: It is safe, and you can’t get safer than safe.
When you inoculate children with a polio vaccine, you don’t sleep well for two or three months.