1.

The anti-Manichaean works date mostly from his earlier life, and in time and matter follow immediately upon his philosophical writings. ¹ In them he afterwards found most to retract, because he advocated the freedom of the will against the Manichaean fatalism. The most important are: De moribus ecclesiae catholicae, et de moribus Manichaeorum, two books (written during his second residence in Rome, 388); De vera religione (390); Unde malum, et de libero arbitrio, usually simply De libero arbitrio, in three books, against the Manichaean doctrine of evil as a substance, and as having its seat in matter instead of free will (begun in 388, finished in 395); De Genesi contra Manichaeos, a defence of the biblical doctrine of creation (389); De duabus animabus, against the psychological dualism of the Manichaeans (392); Disputatio contra Fortunatum (a triumphant refutation of this Manichaean priest of Hippo in August, 392); Contra Epistolam Manichaei quam vocant fundamenti (397); Contra Faustum Manichaeum, in thirty-three books (400-404); De natura boni (404), &c.

These works treat of the origin of evil; of free will; of the harmony of the Old and New Testaments, and of revelation and nature; of creation out of nothing, in opposition to dualism and hylozoism; of the supremacy of faith over knowledge; of the authority of the Scriptures and the Church; of the true and the false asceticism, and other disputed points; and they are the chief source of our knowledge of the Manichaean Gnosticism and of the arguments against it.

Having himself belonged for nine years to this sect, Augustin was the better fitted for the task of refuting it, as Paul was peculiarly prepared for the confutation of the Pharisaic Judaism. His doctrine of the nature of evil is particularly valuable. He has triumphantly demonstrated for all time, that evil is not a corporeal thing, nor in any way substantial, but a product of the free will of the creature, a perversion of substance in itself good, a corruption of the nature created by God.