The Catholic Controversy (Unabridged‪)‬

St. Francis worked hard at evangelizing Calvinist Protestants to return to the Catholic faith. However, they were afraid of the backlash, and so, St. Francis wrote pamphlets and slipped them under doors and posted them on walls. After four years of his efforts, more than 70,000 people had returned to the faith. These pamphlets were compiled into this book, which remains one of the best sources for defending the Catholic faith.