Laughter is a form of internal jogging. It moves your internal organs around. It enhances respiration. It is an igniter of great expectations.

The most costly disease is boredom costly for both individual and society.

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.

It makes little difference how many university courses or degrees a person may own. If he cannot use words to move an idea from one point to another, his education is incomplete.

You are younger today than you will ever be again. Make use of it for the sake of tomorrow.

To be able to rise from the earth; to be able, from a station in outer space, to see the relationship of the planet earth to other planets; to be able to contemplate the billions of factors in precise and beautiful combination that make human existence possible; to be able to dwell on an encounter of the human brain and spirit with the universe

No one really knows enough to be a pessimist.