Gregory of Nyssa (c. 335-394 CE), the youngest and most philosophically adventurous of the three Cappadocian Fathers, developed one of the most original philosophical concepts in the history of Christian thought: epektasis - the doctrine of the soul's perpetual, inexhaustible progress toward an infinite God, grounded in Philippians 3:13 and the narrative of Moses in Exodus 33. His work represents the most profound engagement with the philosophy of desire and transcendence in the Patristic period.
The Thinker and His World
Gregory was born into a remarkable family: his grandmother Macrina the Elder, brother Basil of Caesarea (the oldest of the Cappadocian Fathers and Gregory's intellectual mentor), and sister Macrina the Younger (whose deathbed conversation Gregory recorded in On the Soul and the Resurrection) were all significant figures in the development of Christian theology and monastic life. Gregory became Bishop of Nyssa around 371 CE, was briefly deposed by the Arian emperor Valens, and was restored after Valens's death in 378. He played a major role in the Council of Constantinople (381 CE), which definitively formulated Nicene Trinitarianism.
Gregory was by far the most philosophically sophisticated of the Cappadocians, deeply versed in Middle Platonism, Neoplatonism, and the Stoic tradition. His philosophical ambition was to demonstrate that Christian theology, properly understood, is not the rejection of Greek philosophy but its fulfillment and surpassing - that the Christian account of God as infinite, personal, and loving provides a richer and more philosophically adequate account of ultimate reality than the Neoplatonic One.
Biblical Texts Engaged
Philippians 3:13-14 - 'But one thing I do: forgetting what lies behind and straining forward (epekteinomenos) to what lies ahead, I press on toward the goal for the prize of the upward call of God in Christ Jesus' - is the foundational text for Gregory's concept of epektasis. The Greek word epekteinomenos (stretching forward, straining toward) gives the doctrine its name. Paul's account of the Christian life as a perpetual forward movement - never resting in present achievement, always pressing toward a goal that recedes even as it approaches - becomes, in Gregory's philosophical elaboration, the model for the soul's eternal relationship with an inexhaustible God.
Exodus 33:18-23 - Moses's request to see God's face, and God's answer that no one can see his face and live, but that Moses may see his back as he passes - provides the narrative substance for Gregory's most extended philosophical meditation, the Life of Moses. God shows Moses his 'back' (his glory as it passes) but not his face: the divine essence always exceeds and withdraws from the creature's grasp. This is not a deficiency of Moses or a limitation of revelation; it is the character of the infinite: it can never be fully comprehended, so the encounter with the infinite is an encounter that generates rather than satisfies desire.
1 Corinthians 13:12 - 'For now we see in a mirror dimly, but then face to face. Now I know in part; then I shall know fully, even as I have been fully known' - provides the eschatological horizon. The Platonic tradition had imagined the blessed vision of the Form of the Good as a static contemplation - a permanent resting in fullness. Gregory argues, against this, that even the eschatological vision of God 'face to face' will not exhaust the divine infinity; the beatific vision will be an infinite movement of knowing into the inexhaustible.
Core Argument
Gregory's decisive philosophical move is to argue that the Platonic account of the soul's goal - returning to the One and resting in it - is philosophically inadequate because it treats God as finite: as a definite object that can be fully comprehended and possessed. But God is infinite (apeiros), a term Gregory uses with unprecedented philosophical precision. Infinity, for Gregory, is not a negative concept (lacking boundaries) but a positive metaphysical attribute: God's perfections are inexhaustible, incapable of being fully comprehended by any finite intellect, even a redeemed and glorified one.
The implication for the philosophy of desire is profound. In the Platonic tradition, desire (eros) is a lack: I desire what I do not have, and the satisfaction of desire terminates the desiring. In Gregory's account, the soul's desire for God is never terminated by possession, because what is desired is infinite. The soul in the presence of God desires more - not because it lacks, but because it participates in something that exceeds its capacity and thereby generates ever-deeper desire. This is the paradox of epektasis: fullness generates desire; progress is perpetual because the goal is inexhaustible.
The philosophical implications are significant. Gregory's account implies that the highest human activity - the love of the infinite God - is not a terminal state but an endless movement. This contradicts the eudaimonist tradition's assumption that the highest good is a stable possession. It also provides a positive account of the soul's infinity: made in the image of an infinite God, the human soul is itself in some sense infinite - capable of indefinite growth toward the divine.
Intellectual Context
Gregory was operating in creative tension with the Neoplatonist tradition, particularly Plotinus. Plotinus's account of the soul's return to the One involves a kind of mystical absorption: the individual soul is dissolved in the infinite One. Gregory, committed to the Christian doctrine of personal immortality and the resurrection of the body, argues instead for a personal, relational union with God that preserves - and indeed intensifies - the individual soul's distinctness.
Reception and Critique
Gregory's epektasis was largely unknown in the Latin West until the modern period, when the great French patristic scholar Jean Danielou introduced his thought to wider theological and philosophical audiences. Danielou's Platonisme et Theologie Mystique (1944) remains the standard account. In contemporary theology, Jean-Luc Marion's phenomenology of givenness (which attempts to describe how the excess of the gift - its surplus over the receiver's capacity - generates rather than terminates the reception) has been read as a philosophical development of Gregorian epektasis.
Legacy
Gregory's concept of epektasis established a distinctively Christian philosophy of desire: one in which the highest desire is not terminated by its object but infinitely deepened by it. This has influenced not only mystical theology (John of the Cross, Meister Eckhart, and the whole apophatic tradition) but also philosophy of desire and phenomenology of transcendence in the modern period.
Key Passages
'This is the most marvellous thing of all: how the same thing is both a standing still and a moving... For this is truly perfection: never to stop growing towards what is better and never to place any limit on perfection.' (Life of Moses II.242)
'We define perfection to consist in the soul never ceasing to progress towards what is better.' (Life of Moses II.305)
Contemporary Relevance
Gregory's philosophy of infinite desire offers a profound alternative to two modern pathologies: the consumerist assumption that satisfaction is achievable through sufficient acquisition, and the nihilistic resignation that no genuine good can be found. His account of the soul's infinite orientation toward an inexhaustible God suggests that the deepest human longing is not for a finite object that can be possessed but for an infinite reality that can be participated in without ever being exhausted.