5. Justin relates these things, and Irenæus also agrees with him in the first book of his work, Against Heresies, where he gives an account of the man and of his profane and impure teaching. It would be superfluous to quote his account here, for it is possible for those who wish to know the origin and the lives and the false doctrines of each of the heresiarchs that have followed him, as well as the customs practiced by them all, to find them treated at length in the above-mentioned work of Irenæus.