Francis de Sales
1567 — 1622 · Feast day: January 24
Francis de Sales risked his life slipping pamphlets under doors to re-evangelize the Calvinist Chablais region, winning back thousands to Catholicism without violence. His 'Introduction to the Devout Life' was the first systematic guide to holiness written for soldiers, merchants, and housewives — not monks — and has never gone out of print since 1609.