Irenaeus concludes with a warning to avoid all heresies, of which, he says, there are three basic types: the first denies the Father and imagines another God; the second denies the Son and imagines there was no incarnation, and thus no love of God for humanity or our flesh; the third denies the Spirit and despises the true prophecy of Scripture. Instead of falling into such errors, Irenaeus bids the reader to hold to the oldest and truest preaching, that of the true God, the coming of his Son and the gift of his Spirit.
