The heart of the matter is that some people like to cause injury or death to living things. And many of those who do not are indifferent to those who do.

Second only to freedom, learning is the most precious option on earth.

Laughter may or may not activate the endorphins or enhance respiration, as some medical researchers contend. What seems clear, however, is that laughter is an antidote to apprehension and panic.

Nature has not been lavish in her endowments, but each person has his or her own potential in terms of achievement and service. The awareness of that potential is the discovery of purpose; the fulfillment of that potential is the discovery of strength.

I've learned that next to the atomic bomb, the greatest danger is defeatism, despair, and inadequate awareness of what human beings possess. I feel that any problem that can be defined is capable of being resolved. Out of this has come my conviction that no person knows enough to be a pessimist.

Belief creates biology.

I have learned never to underestimate the capacity of the human mind and body to regenerate - even when prospects seem most wretched. The life force may be the least understood force on earth.