Perfect God and Perfect Man: The Athanasian Creed on the Incarnation

The second half of the Athanasian Creed turns from the Trinity to the Incarnation — the doctrine that in Jesus Christ, God became man. This is not a simpler subject; it is equally profound and equally contested. The creed approaches it with the same methodical precision it brought to the Trinity, defining what the Incarnation is and ruling out what it is not.

'God and Man' — The Two Natures

The creed states: 'For the right Faith is, that we believe and confess, that our Lord Jesus Christ, the Son of God, is God and Man. God of the Substance of the Father, begotten before the worlds; and Man of the substance of His Mother, born in the world. Perfect God and perfect Man, of a reasonable Soul and human Flesh subsisting.' Christ is not semi-divine and semi-human — He is fully both. He is not a demigod or a spiritual being who merely appeared human. He took on full humanity — body and soul.

'Not Two, But One Christ' — The Unity of Person

If Christ has two natures, does that make Him two persons? The creed answers firmly: no. 'Who, although He be God and Man, yet He is not two, but one Christ. One; not by conversion of the Godhead into flesh, but by taking of the Manhood into God. One altogether; not by confusion of Substance, but by unity of Person.' The divine nature was not transformed into human nature, nor were they blended together into a new thing. They were united in one Person, Jesus Christ.

Why This Doctrine Matters

The stakes are not merely academic. A Christ who is not truly God cannot offer the infinite atonement that human sin requires. A Christ who is not truly Man cannot stand in humanity's place before God, cannot be tempted as we are tempted, and cannot be the firstborn of a new humanity. The Athanasian Creed's insistence on 'perfect God and perfect Man' is the theological foundation of the entire Gospel.

The creed closes this section by anchoring the Incarnation in history and eschatology: Christ suffered, descended into hell, rose the third day, ascended to the right hand of the Father, and 'shall come to judge the quick and the dead.' The doctrine of the Incarnation is not a static metaphysical claim — it is the story of God entering time to redeem it, and the promise that He will return to complete what He began.