The safest and most suitable form of penance seems to be that which causes pain in the flesh but does not penetrate to the bones, that is, which causes suffering but not sickness. So the best way seems to be to scourge oneself with thin cords which hurt superficially, rather than to use some other means which might produce serious internal injury.
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About Ignatius of Loyola
Ignatius of Loyola was a medieval basque spaniard catholic priest and theologian. Ignatius of Loyola, venerated as Saint Ignatius of Loyola, was a Spanish Catholic priest and theologian, who, with six companions, founded the religious order of the Society of Jesus (Jesuits), and became its first Superior General, in Paris in 1541. Read more on Wikipedia →