This treatise, and the following, were written against somewhat that still remained of the heresy of Jovinian. S. Aug. mentions this error in b. ii. c. 23, de Nuptiis et Conc. "Jovinianus," he says, "who a few years since tried to found a new heresy, said that the Catholics favored the Manichæans, because in opposition to him they preferred holy Virginity to Marriage." And in his book on Heresies, c. 82. "That heresy took its rise from one Jovinianus, a Monk, in our own time, when we were yet young." And he adds that it was soon overborne and extinguished, say about A.D.390, having been condemned first at Rome, then at Milan. There are letters of Pope Siricius on the subject to the Church of Milan, and the answer sent him by the Synod of Milan, at which St. Ambrose presided. Jerome had refuted Jovinian, but was said to have attempted the defense of the excellency of the virgin state, at the expense of condemning marriage. That Augustin might not be subject to any such complaint or calumny, before speaking of the superiority of Virginity, he thought it well to write on the Good of Marriage.