Nicene and Post-Nicene Fathers: Series II/Volume III/Lives of Illustrious Men/Gennadius/Sabbatius the bishop

, bishop of the Gallican province, at the request of a certain virgin, chaste and devoted to Christ, Secunda by name, composed a book On faith against Marcion and Valentinus his teacher, also against Eunomius and his Master A&#235;tius, showing, both by reason and by testimony of the Scriptures, that the origin of the deity is one, that the Author of his eternity and the Creator of the earth out of nothing, are one and the same, and likewise concerning Christ, that he did not appear as man in a phantasm but had real flesh through which eating, drinking, weary and weeping, suffering, dying, rising again he was demonstrated to be man indeed. For Marcion and Valentinus had been opposed to these opinions asserting that the origin of Deity is twofold and that Christ came in a phantasm. To A&#235;tius indeed and Eunomius his disciple, he showed that the Father and Son are not of two natures and equal in divinity but of one essence and the one from the other, that is the Son from the Father, the one coeternal with the other, which belief A&#235;tius and Eunomius opposed.