The main trouble with despair is that it is self-fulfilling. People who fear the worst tend to invite it. Heads that are down can't scan the horizon for new openings. Bursts of energy do not spring from a spirit of defeat. Ultimately, helplessness leads to hopelessness.

All this sensory input, which begins in the brain, has its effect throughout the body.

The more serious the illness, the more important it is for you to fight back, mobilizing all your resources-spiritual, emotional, intellectual, physical.

All things are possible, once enough human beings realize that everything is at stake.

Optimism doesn't wait on facts. It deals with prospects. Pessimism is a waste of time.

Ten minutes of genuine belly laughter had an anesthetic effect and would give me at least two hours of pain-free sleep.

The growth of the human mind is still high adventure, in many ways the highest adventure on earth.