My reason nourishes my faith and my faith my reason.

The possibility of war increases in direct proportion to the effectiveness of the instruments of war.

The message from the moon which we have flashed to the far corners of this planet is that no problem need any longer be considered insoluble.

The tragedy of life is in what dies inside a man while he lives - the death of genuine feeling, the death of inspired response, the awareness that makes it possible to feel the pain or the glory of other men in yourself.

The essence of man is imperfection. Failure is simply a price we pay to achieve success. If we learn to embrace that new definition of failure, then we are free to start moving ahead - and failing forward.

The control center of your life is your attitude.

What was significant about the laughter . . . was not just the fact that it provides internal exercise for a person . . . form of jogging for the innards, but that it creates a mood in which the other positive emotions can be put to work, too.