For without belittling the courage with which men have died, we should not forget those acts of courage with which men — such as the subjects of this book — have lived. The courage of life is often a less dramatic spectacle than the courage of a final moment; but it is no less a magnificent mixture of triumph and tragedy. A man does what he must — in spite of personal consequences, in spite of obstacles and dangers, and pressures — and that is the basis of all human morality. In whatever area in life one may meet the challenges of courage, whatever may be the sacrifices he faces if he follows his conscience — the loss of his friends, his fortune, his contentment, even the esteem of his fellow men — each man must decide for himself the course he will follow. The stories of past courage can define that ingredient — they can teach, they can offer hope, they can provide inspiration. But they cannot supply courage itself. For this each man must look into his own soul.

John F. Kennedy (1917-1963) US President (1961-63)
Profiles in Courage (1956; 1964 ed.)