Christological development from the second to fifth centuries moved through a series of crises, each clarifying what the Church could not say about Christ before arriving at the conciliar definitions. The second century confronted Docetism (Christ only appeared human) and Ebionism (Christ was merely human); the fourth century fought the Arian claim that the Son is a creature, answered decisively by Athanasius; and the fifth century resolved how divine and human natures relate in the single person of Christ through the Nestorian controversy, settled at Ephesus (431 AD). Augustine contributed the theological grounding: the incarnation was pure divine grace — human nature assumed without prior merit, conceived through faith not carnal desire. Each step was driven by the question: how do we worship Christ as God without denying his full humanity?
Defends eternal begetting against Arian creaturely sonship — "that the Father begat we are taught in many places... unto us a child is born, unto us a son is given" — establishing homoousios as the Nicene standard that distinguishes the Son from all creatures.
The hypostatic union as pure divine grace: "What had the human nature in the man Christ merited, that it, and no other, should be assumed into the unity of the Person of the only Son of God?" — Christ's mediation grounds Christology in the incarnation's salvific purpose, reconciling humanity's wrath-laden condition.
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