John x. 18. Written about the year 397. In making this document the basis of his attack, Augustin felt that he had selected the best-known and most generally accepted standard of the Manichaean faith. The tone of the work is conciliatory, yet some very sharp thrusts are made at Manichaean error. The claims of Mani to be the Paraclete are set aside, and the absurd cosmological fancies of Mani are ruthlessly exposed.
Dualism is combated with substantially the same weapons as in the treatise Concerning Two Souls .
We could wish that the author had found time to finish the treatise, and had thus preserved for us more of the Fundamental Epistle itself. John i. 9. 7 Acts i. 26. 8 Acts ix. 9 John xiv.