From Evelyn Waugh's Edmund Campion: A Life:
He was one of a host of martyrs, each, in their several ways, gallant and venerable; some performed more sensational feats of adventure, some sacrificed more conspicuous positions in the world, many suffered crueller tortures, but to his own, and to each succeeding generation, Campion's fame has burned with unique warmth and brilliance; it was his genius to express, in sentences that have resounded across the centuries, the spirit of chivalry in which they suffered, to typify in his zeal, his innocence, his inflexible purpose, the pattern which they followed.
It was an age replete with examples of astounding physical courage. Judged by the exploits of the great adventurers of his time, the sea-dogs and explorers, Campion's brief achievement may appear modest enough; but these were tough men, ruthlessly hardened by upbringing, gross in their recreations. Campion stands out from even his most gallant and chivalrous contemporaries, from Philip Sidney and Don John of Austria, not as they stand above Hawkins and Stukeley by finer human temper, but by the supernatural grace that was in him. That the gentle scholar, trained all his life for the pulpit and the lecture room, was able at the word of command to step straight into a world of violence, and acquit himself nobly; that the man, capable of the strenuous heroism of that last year and a half, was able, without any complaint,to pursue the sombre routine of the pedagogue and contemplate without impatience a lifetime so employed--there lies the mystery which sets Campion's triumph apart from the ordinary achievements of human strength; a mystery whose solution lies in the busy, uneventful years at Brunn and Prague, in the profound and accurate piety of the Jesuit rule.
[Evelyn Waugh, Edmund Campion: A Life, Ignatius Press (San Francisco: 2005), pp. 200-201.]