Iamblichus of Chalcis

Iamblichus of Chalcis (c. 245–c. 325 AD) was the architect of Syrian Neoplatonism and the primary philosophical defender of theurgy (divine ritual work). He is central to the late antique Hermetic milieu.

The De Mysteriis and the Way of Hermes

In his masterwork, the De Mysteriis Aegyptiorum (On the Mysteries of the Egyptians), written under the pseudonym of an Egyptian priest named Abammon, Iamblichus explicitly aligns his theurgical system with the teachings of Hermes Trismegistus. He claims that all true theological knowledge comes from the "pillars of Hermes," which Pythagoras and Plato merely translated into Greek.

Theurgy vs. Theology

Iamblichus argued against his teacher Porphyry's purely intellectual approach. Iamblichus posited that the human soul is fully descended into matter and cannot achieve union with the One through thought alone. It requires synthemata (divine symbols, stones, herbs, incantations) embedded in the material world by the Demiurge. As Christian Bull and Garth Fowden demonstrate, Iamblichus's "Egyptian" theology in the De Mysteriis closely parallels the cosmology and ritual mechanics found in the Hermetic Asclepius and the Stobaean fragments, proving that Hermetic texts were actively used as liturgical manuals in theurgical circles.