Plotinus (204-270 CE), the founder of Neoplatonism, developed a metaphysics of 'the One' - the transcendent, ineffable source from which all reality emanates through the nous (divine intellect) and the soul - that became the philosophical framework through which Augustine, Pseudo-Dionysius, Meister Eckhart, and the Christian mystical tradition understood the God of the Bible. Though derived primarily from Plato's Parmenides and Timaeus, Plotinus's metaphysics ran strikingly parallel to biblical monotheism in several respects: its insistence on the absolute transcendence and unity of the first principle, its account of the soul's longing for return to its source, and its notion of participation as the ontological relation between creature and Creator. The encounter between Plotinus's Enneads and the Christian Scriptures, mediated by Porphyry's edition of the Enneads (c. 301 CE) and by Marius Victorinus's translation (c. 355 CE), shaped the intellectual development of Augustine and through him the entire Latin Christian tradition.
The Thinker and His Work
Plotinus was born in Egypt, studied philosophy for eleven years under Ammonius Saccas in Alexandria (who also taught Origen the Christian), traveled to Persia with the emperor Gordian III's military expedition in hopes of learning Eastern wisdom, settled in Rome around 244 CE, and taught there until his death. His student and editor Porphyry arranged his fifty-four treatises into six groups of nine (hence 'Enneads,' from the Greek for 'nines'), publishing them after Plotinus's death. Plotinus wrote in dense, difficult Greek, primarily for a philosophical elite, and his works are among the most demanding in the Western philosophical canon.
Biblical Texts Engaged
Exodus 3:14 - 'God said to Moses, "I AM WHO I AM."' - was read by Neoplatonically influenced Christian theologians as a philosophical statement of the first principle's pure being, identical with Plotinus's description of the One as beyond being or as being itself. Augustine, in De Trinitate, explicates 'I AM WHO I AM' using the Plotinian concept of being: God is that which truly is, the simple, unchanging, necessary being from which all contingent being derives. This identification of the biblical God with the Plotinian first principle was the decisive intellectual move that shaped Western Christian theology.
Isaiah 6:3 - 'Holy, holy, holy is the Lord of hosts; the whole earth is full of his glory' - the Trisagion - grounds the liturgical tradition's encounter with the absolutely transcendent God. Plotinus's philosophical description of the encounter with the One - ecstatic, wordless, beyond all predication - provided the conceptual vocabulary for the mystical theology of Gregory of Nyssa, Pseudo-Dionysius, and Meister Eckhart, who used it to interpret both the prophetic visions of Isaiah and Ezekiel and the New Testament language of divine union.
Romans 11:36 - 'For from him and through him and to him are all things. To him be glory forever. Amen' - expresses the Pauline account of the cosmos's relationship to God in language that closely parallels Plotinus's emanation scheme: from the One (the source), through the nous (the mediating principle), to the All (the totality of beings), with all things returning to their source. Neoplatonically inclined readers of Paul (Origen, Augustine, Eriugena) consistently read Romans 11:33-36 through a Plotinian lens.
Core Argument
Plotinus's metaphysics is organized around three 'hypostases' or primary levels of reality: the One (the absolutely transcendent first principle), the nous (divine intellect, which contains all the Platonic Forms as its thoughts), and the soul (the lowest divine principle, which generates time and the material world). From the One, reality emanates in a kind of overflow of abundance - not intentionally or temporally but necessarily and eternally, as light radiates from the sun. The material world is the lowest level of emanation, not evil in itself (against the Gnostics) but furthest from the source of being.
The human soul, as a fragment of the world-soul, retains a memory of its divine origin and is drawn back toward the One by intellectual and spiritual ascent. The highest moment of this ascent is the mystical union (henosis) with the One - an ecstatic experience beyond thought and language in which the distinction between the knower and the known temporarily dissolves. Plotinus describes his own mystical experience in Enneads IV.8.1: 'Often I have woken to myself out of the body, become external to all other things and entered into myself; I have seen a beauty wonderfully great.'
Intellectual Context
Plotinus was reviving Plato against what he saw as the materialist corruptions of Stoicism and Epicureanism and the dualistic corruptions of Gnosticism. He was also in dialogue with Aristotle, whose concept of the divine nous (the unmoved mover, the pure thought thinking itself) he incorporated into the second hypostasis. His debate with the Gnostics - conducted in Enneads II.9 ('Against the Gnostics') - argues that the material world is not evil but is the beautiful expression of soul's creative power, shaped by the Forms it contains.
Reception and Critique
Augustine's Confessions records his reading of 'the Platonists' (Plotinus and Porphyry, in Marius Victorinus's translation) as the decisive intellectual preparation for his conversion to Christianity. What the Platonists showed him was the absolutely transcendent, immaterial God; what they could not show him was the way of return to God through Christ's humility. The Incarnation - the One taking on flesh - was the stumbling block that Neoplatonism could not accommodate and that Augustine found only in the Gospel of John. Augustine's synthesis of Neoplatonic metaphysics and Christian revelation shaped the entire Latin theological tradition: Aquinas, Ockham, and even Luther worked within a framework that Augustinian Neoplatonism had established.
Pseudo-Dionysius the Areopagite (c. 500 CE) was the thinker who most completely fused Plotinian Neoplatonism (mediated through Proclus) with Christian theology, producing an account of apophatic (negative) theology and mystical ascent that became the foundation of the Christian mystical tradition. Through Pseudo-Dionysius, Plotinus's concept of the One as beyond all predication became the standard philosophical theology of medieval Christian mysticism.
Legacy
Plotinus established the philosophical vocabulary of mysticism that the Christian tradition has used to describe the soul's relationship to God: emanation, participation, return, union, the darkness of unknowing, the ecstasy of contact with the One. These categories are not identical with biblical categories - the biblical God is personal, acts in history, and is known through covenant and commandment rather than through philosophical ascent - but they provided the philosophical articulation of aspects of biblical religion (divine transcendence, the soul's longing for God, mystical union) that the biblical texts express but do not systematically analyze.
Key Passages
'If someone sees it, what passion seizes him, what longing to be mixed into it, what amazement and pleasure! He who has not yet seen it yearns for it as good; he who has seen it marvels at it as beautiful and is full of wonder and delight.' (Enneads I.6.7, trans. Dillon and Gerson)
Contemporary Relevance
The encounter between Plotinian Neoplatonism and biblical religion that Augustine mediated has acquired new relevance in the context of contemporary interreligious dialogue. The mystical traditions of Christianity, Islam, and Judaism all draw on Plotinian vocabulary - apophasis, emanation, union, return - creating a common philosophical substrate for mystical encounter that transcends the specific doctrinal differences of the traditions. The contemporary philosopher David Bentley Hart has argued in The Beauty of the Infinite (2003) that Neoplatonic metaphysics of participation provides the most adequate philosophical account of the Christian doctrine of creation ex nihilo, making Plotinus's influence on Christian theology not a historical accident but a philosophical necessity.