Irenaeus, a prominent early Christian theologian of the 2nd century, is best known for his work "Against Heresies" (Adversus Haereses). As a disciple of Polycarp, who was himself a disciple of the Apostle John, Irenaeus had a direct link to the teachings of the apostles, lending significant authority to his writings and arguments.

Book Two of "Against Heresies" delves deeper into the refutation of Gnostic doctrines, particularly focusing on their cosmology and metaphysics. Irenaeus critiques the Gnostic understanding of the origin and structure of the universe, exposing the inconsistencies and philosophical flaws in their teachings. He emphasizes the rational and coherent nature of the Christian faith in contrast to the esoteric and often convoluted Gnostic systems.

Many people read about the early Church Fathers, but few actually engage with their original writings. Here is an opportunity to read Irenaeus's own words and gain firsthand insight into the theological battles of the early Church.