St. Irenaeus of Lyons - Against the Heresies Vol 2
Dominic J. Unger
In this book, St. Irenaeus of Lyons refutes the gnosis of the Valentinians and the Marcionites from reason.
This work, which establishes Irenaeus as the most important of the theologians of the second century, is a detailed and effective refutation of Gnosticism, and a major source of information on the various Gnostic sects and doctrines.