Against Eunomius
For For students of the Arian controversy and of how the Cappadocians argued about God's names and nature; not a work to read through, and not for a first meeting with Gregory.
Length About 250,000 words, about 15 hours.
Gregory of Nyssa's Against Eunomius stands as one of the most sophisticated theological treatises of the fourth century, written in three books between 380 and 383 to refute the radical Arian theology of Eunomius of Cyzicus. Eunomius had developed what he considered an irrefutable logical system proving that the Son was utterly unlike the Father in essence, publishing works that challenged not only Nicene orthodoxy but the very possibility of divine mystery. Gregory undertook this massive refutation at the urging of his brother Basil's followers, who recognized that Eunomius's philosophical precision required an equally rigorous response.
The Architecture of Divine Mystery
Gregory's strategy involves dismantling Eunomius's rationalist approach to divine knowledge while constructing a positive account of how human language and thought can authentically engage divine reality. He demonstrates that Eunomius's system rests on the false assumption that human concepts can exhaustively capture divine essence, arguing instead that God's essence remains fundamentally incomprehensible while genuinely knowable through divine activities or energies. Gregory shows how Eunomius's logical method, when applied consistently, leads to absurd conclusions about divine simplicity and the nature of generation.
The treatise advances a sophisticated epistemology of divine knowledge that distinguishes between knowing God's essence, which remains beyond human comprehension, and knowing God through divine operations and attributes revealed in scripture and creation. Gregory argues that the names we apply to God—whether "unbegotten," "begotten," or "proceeding"—refer to real divine realities without delimiting divine essence. This allows him to maintain both divine transcendence and the meaningfulness of theological language.
Central to Gregory's argument is his defense of divine generation as a mode of being rather than a temporal process or diminishment of divine nature. He demonstrates how the Father's generation of the Son involves no change, division, or inequality in the divine essence, while maintaining real distinction between the persons. Gregory's treatment of divine infinity becomes crucial here, showing how infinite divine nature can be fully present in each person of the Trinity without multiplication or division.
Enduring Significance
Against Eunomius established principles for theological method that shaped both Eastern and Western Christianity's approach to divine knowledge and trinitarian doctrine. Gregory's distinction between divine essence and energies influenced centuries of Byzantine theology, while his epistemological insights about the limits and possibilities of theological language anticipated many concerns of modern theology. The work demonstrates how rigorous philosophical analysis can serve theological orthodoxy without compromising divine mystery.
The treatise remains essential reading for anyone seeking to understand how classical Christianity navigated the relationship between reason and revelation, or how trinitarian doctrine developed its sophisticated conceptual vocabulary. Gregory's method of combining careful logical analysis with mystical sensibility offers resources for contemporary theologians wrestling with questions of religious language and divine transcendence.
Who should read this: Systematic theologians, students of patristic thought, and anyone interested in the philosophical foundations of trinitarian doctrine will find this work indispensable, though its technical theological vocabulary and complex argumentation make it unsuitable for casual readers or those without background in classical Christian doctrine.
Editions
External off-site sources
Free downloads
- OTHER Against Eunomius (New Advent) PDTrans. W. Moore, H. A. Wilson and H. C. OgleSource: New Advent ↗The 1893 Nicene and Post-Nicene Fathers translation of the twelve books, by William Moore, H. A. Wilson and H. C. Ogle, on New Advent: an index page linking one page per book, each with the NPNF chapter summaries and some notes. The only English version of the whole work; for students of the Arian controversy rather than general readers.
- OTHER Against Eunomius (CCEL) PDTrans. W. Moore, H. A. Wilson and H. C. Ogle · 1893W. Moore, H. A. Wilson and H. C. Ogle's 1893 translation on the Christian Classics Ethereal Library's reading pages for volume 5 of the Nicene and Post-Nicene Fathers, with the headings for the twelve books and the NPNF footnotes kept. The same text as New Advent's, free of its revisions; for students of the Arian controversy, not for reading through.
- OTHER Against Eunomius (New Advent — Answer to Eunomius' Second Book) PD AbridgedTrans. M. Day · 1893M. Day's translation of the 'Answer to Eunomius' Second Book' (the book Jaeger numbers II), as printed in the Nicene and Post-Nicene Fathers, second series, volume 5 (1893), on New Advent. One book of the work, the reply to Eunomius's second book; the other twelve are on New Advent's Against Eunomius pages.
- OTHER Against Eunomius (CCEL — Answer to Eunomius' Second Book) PD AbridgedTrans. M. Day · 1893M. Day's translation of the 'Answer to Eunomius' Second Book' on the Christian Classics Ethereal Library's reading pages for NPNF2-05, with the NPNF footnotes. One book of the work; the twelve books are under CCEL's Against Eunomius.
- OTHER Against Eunomius (Wikisource) PDTrans. W. Moore, H. A. Wilson and H. C. Ogle · 1893W. Moore, H. A. Wilson and H. C. Ogle's 1893 translation in Wikisource's transcription of the Nicene and Post-Nicene Fathers, second series, volume 5: one page for each book, footnotes kept, plain text that reads well on a phone. For students of the Arian controversy, not for reading through.
- OTHER Against Eunomius (Wikisource — Answer to Eunomius' Second Book) PD AbridgedTrans. M. Day · 1893M. Day's translation of the 'Answer to Eunomius' Second Book' in Wikisource's transcription of NPNF2-05, with its footnotes. One book of the work; the twelve books are under Wikisource's Against Eunomius.
- PDF Against Eunomius (Internet Archive (NPNF2-05 scan)) PDTrans. William Moore and Henry Austin Wilson · 1893A scan of the 1893 volume of the Nicene and Post-Nicene Fathers devoted to Gregory of Nyssa (University of Toronto copy), with Moore and Wilson's translations, the prolegomena and the notes as printed. Page images of the whole book; this work is in it, for readers who want the text as published.
- PDF Against Eunomius (Internet Archive (Jaeger 1921, vol. 1)) PD Abridged Greek1921Werner Jaeger's critical edition of the Greek text (Berlin, 1921), volume 1: books I and II (the NPNF's Book I and 'Answer to Eunomius' Second Book'), with a Latin preface and full apparatus. The edition scholars cite; for readers of Greek.Much harder than the work: Greek only, no translation; the first of two volumes
- PDF Against Eunomius (Internet Archive (Jaeger 1921, vol. 2)) PD Abridged Greek1921Werner Jaeger's critical edition of the Greek text (Berlin, 1921), volume 2: book III (the NPNF's books III to XII) and the Refutation of Eunomius's confession (the NPNF's Book II), with apparatus. For readers of Greek.Much harder than the work: Greek only, no translation; the second of two volumes
- PDF Against Eunomius (Internet Archive (Oehler 1865)) PD Greek1865Franz Oehler's edition of the Greek text of the books against Eunomius (Halle, 1865), the first volume of his Gregorii Nysseni opera, with a Latin preface and no translation. Superseded by Jaeger but still readable; for readers of Greek.Much harder than the work: Greek only, no translation
- PDF Against Eunomius (Internet Archive (Migne PG 45)) PD Greek and Latin1863The Greek text with Migne's Latin translation in parallel columns, in volume 45 of the Patrologia Graeca (Paris, 1863), scanned whole on the Internet Archive; this work is at columns 243-1122. For readers of Greek or Latin.Much harder than the work: Greek and Latin only, no English translation