| Catholic Encyclopedia: Gnosticism: Gnosticism, as a syncretistic, dualistic system has been historically regarded by orthodox Christians as a heresy. | |
| Definition of Gnosticism: Gnosticism died not by chance, but because it lacked vital power within itself; and no amount of theosophistic literature can give life to that which perished from intrinsic and essential defects. | |
| Medieval Sourcebook: Bernard Gui on the Albigensians: Offers an account of a Catholic Inquisitor on the Cathar faith. | |
| Strange Fire: Rise of Gnosticism in the Church: Book by Travers and Jewel van der Merwe offering a Christian view of ancient and neo-Gnostic beliefs. |
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