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

There is a moment of conception and a moment of birth, but between them there is a long period of gestation.

Life is an error-making and an error-correctin g process, and nature in marking man's papers will grade him for wisdom as measured both by survival and by the quality of life of those who survive.

Eventually we'll realize that if we destroy the ecosystem, we destroy ourselves.

Life is an error-making and an error-correcting process.

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

Are we being good ancestors?