Purpose
The purpose of Against Heresies was to refute the teachings of various Gnostic groups; apparently, several Greek merchants had begun an oratorial campaign praising the pursuit of "gnosis" in Irenaeus' bishopric. Another popular theory states that a group of Gnostics known as the Valentinians remained part of the early Christian church, taking part in regular church celebrations despite their radical differences. It is also said that Gnostics would secretly meet outside of regular church activity where they would discuss their "secret knowledge" and scripture that pertains to it. As bishop, Irenaeus felt obligated to keep a close eye on the Valentinians and to safeguard the church from them. In order to fulfil this duty, Irenaeus educated himself and became well informed of Gnostic doctrines and traditions. This eventually led to the compilation of his treatise.
It appears however, that the main reason Irenaeus took on this work was because he felt that Christians in Asia and Phrygia especially needed his protection from Gnostics, for they did not have as many bishops to oversee and help keep problems like this under control (probably only one bishop was assigned to a number of communities). Therefore, due to the issue of distance between Irenaeus (who was in the western Roman province of Gaul) and the orthodox Christian community of Asia, Irenaeus found that writing this treatise would be the best way to offer them guidance.
Until the discovery of the Library of Nag Hammadi in 1945, Against Heresies was the best surviving contemporary description of Gnosticism.
This publication is historically important as the dating of the publication is irrefutable and the document is amongst the earliest non-controversial confirming documentations for many of the sayings of Jesus and the Letters of Paul.
Read more about this topic: On The Detection And Overthrow Of The So-Called Gnosis
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