Work dossier · summary and historical context
Gregory of Nyssa's Ad Simplicium de fide (ca. 380–385 CE) is a theological treatise in letter form, responding to queries from a certain Simplicius on the Trinity and divine nature. The work defends the eternal, uncreated status of the Son against Arian interpretations, using precise Greek terminology such as 'πρόσφατον' (recent) and 'ἀλλότριον' (foreign) to argue that a created Son would be alien to the divine essence. The Greek text survives in medieval manuscripts from the 10th–12th centuries, with the critical edition by Werner Jaeger (1921) serving as the basis for modern translations. The identity of Simplicius remains uncertain, possibly a layman or monk, and the work's influence was largely confined to the Byzantine tradition until its Latin translation in the 16th century.
Ad Simplicium de fide is a key text for understanding late 4th-century Trinitarian theology, particularly the Cappadocian response to Arianism. Its precise terminology influenced later Byzantine theology, including John of Damascus, and it remains a source for studying Gregory's mature thought on the eternal nature of the Son. The work's limited Western transmission highlights the divergent theological trajectories of East and West.
Gregory of Nyssa, a leading Cappadocian Father, wrote Ad Simplicium de fide in the late 4th century (ca. 380–385 CE), a period of intense Trinitarian controversy following the Council of Constantinople (381). The work addresses a layman or monk named Simplicius, whose theological background is not independently attested, suggesting a personal pastoral context. The treatise engages with Arian arguments that the Son is a creature, countering with the claim that the Son is eternal and not 'recent' (πρόσφατον) or 'foreign' (ἀλλότριον) to the divine nature. The Greek text survives in medieval manuscripts from the 10th–12th centuries, with the earliest witnesses postdating the original by centuries. The critical edition by Werner Jaeger (Gregorii Nysseni Opera, 1921) is the standard reference. The work was cited by later Byzantine theologians like John of Damascus, but its Latin translation only appeared in the 16th century, limiting its Western medieval reception.
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