What don't Christians believe? Is Jesus really divine? Is Jesus really human? Can God suffer? Can people be saved by their own efforts? The early church puzzled over these questions, ruling in some beliefs and ruling out others. Heresies and How to Avoid Them explains the principal ancient heresies and shows why contemporary Christians still need to know about them. These famous detours in Christian believing seemed plausible and attractive to many people in the past, and most can still be found in modern-day guises. By learning what it is that Christians don't believe--and why--believers today can gain a deeper, truer understanding of their faith. --! From back cover.

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. This volume contains Book One. +

In this new edition of a classic work, the great Catholic apologist and historian Hilaire Belloc examines the five most destructive heretical movements in Christianity: Arianism, Mohammedanism (Islam), Albigensianism, Protestantism, and Modernism. Belloc describes how these movements began, how they spread, and how they have continued to influence the world. He accurately predicts the re-emergence of militant Islam and its violent aggression against Western civilization. When we hear the word "heresies", we tend to think of distant centuries filled with religious quarrels that seemed important at the time but are no longer relevant. Belloc shows that the heresies of olden times are still with us, sometimes under different names and guises, and that they still shape our world.

"Against Heresies - Book IV" from Irenaeus. Bishop of Lugdunum in Gaul (-202A.D.).