Ante-Nicene Fathers: St. Irenaeus of Lyons, Against Heresies (Book 3)
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Against Heresies, Book III preface. Thou hast indeed enjoined upon me, my very dear friend, that I should bring to light the Valentinian doctrines, concealed, as their votaries imagine; that I should exhibit their diversity, and compose a treatise in refutation of them. I therefore have undertaken—showing that they spring from Simon, the father of…