Physical fitness is not only one of the most important keys to a healthy body, it is the basis of dynamic and creative intellectual activity. The relationship between the soundness of the body and the activities of the mind is subtle and complex. Much is not yet understood. But we do know what the Greeks knew: that intelligence and skill can only function at the peak of their capacity when the body is healthy and strong; that hardy spirits and tough minds usually inhabit sound gods.
John F. KennedyA full scale nuclear exchange, lasting less than 60 minutes...could wipe out more than 300 million Americans, Europeans, and Russians, as well as untold numbers elsewhere. And the survivors-as Chairman Khrushchev warned the Communist Chinese, `the survivors would envy the dead.' For they would inherit a world so devastated by explosions and poison and fire that today we cannot conceive of its horrors.
John F. Kennedy