Everything in God's Divine Economy reaches its fulfillment in Jesus Christ. The prophets, the Law, the sacrifices, the priesthood and the covenants all pointed toward Him. Christianity is not primarily centered on a set of teachings or moral principles but on the Person of Jesus Christ, through whom God accomplished the salvation of the world.
Christians believe in one God who exists eternally as three distinct Persons: the Father, the Son and the Holy Spirit. This mystery is known as the Holy Trinity. The three Persons are not three gods but one God, sharing the same divine nature, glory and majesty. The Father is not the Son, the Son is not the Holy Spirit and the Holy Spirit is not the Father; yet each is fully and equally God. Throughout the history of salvation, the Father sends the Son, the Son accomplishes the work of redemption and the Holy Spirit applies that saving work to the Church and to believers. Although their roles in salvation are distinct, they always act together as the one true God.
Jesus Christ is the Second Person of the Holy Trinity, the eternal Son of God.
The Son of God did not begin to exist at His birth in Bethlehem. He is the eternal Word (Logos) through whom all things were created (John 1:1–3). He is "the image of the invisible God" (Colossians 1:15) and "the radiance of God's glory and the exact imprint of His nature" (Hebrews 1:3). Being fully divine, He possesses everything that belongs to God: eternity, holiness, omnipotence, wisdom and glory.
The New Testament reveals that Jesus is both fully God and fully man. He is not partly God and partly man, nor did He merely appear to be human. He possesses two complete natures, divine and human, perfectly united in one Person without confusion, change, division or separation. This mystery, affirmed by the Early Church at the Council of Chalcedon (AD 451), is known as the Hypostatic Union.
In the fullness of time, the eternal Son became man through the Holy Spirit and the Virgin Mary (Luke 1:35; Galatians 4:4). Without ceasing to be God, He assumed a complete human nature, including a human body, mind, will and soul. As the Gospel of John declares, "The Word became flesh and dwelt among us" (John 1:14). He truly experienced human life, growing, learning, suffering, being tempted and even dying, yet without sin (Hebrews 4:15).
The Incarnation was necessary because humanity's problem could not be solved by a mere teacher, prophet or angel. Only God could save humanity and only a true man could represent humanity. As the Early Church Fathers often taught, "what is not assumed is not healed." By taking our human nature upon Himself, Christ entered our condition in order to heal, restore and unite it once again with God.
Jesus is therefore the perfect mediator between God and humanity (1 Timothy 2:5). Because He is truly God, He reveals the Father perfectly. Because He is truly man, He represents humanity perfectly. In Him, divinity and humanity meet without either being diminished. He bridges the separation caused by sin and restores communion between God and mankind.
Throughout His earthly ministry, Jesus revealed both His divinity and His humanity. He grew weary, hungered, wept and suffered as a man. Yet He forgave sins, calmed storms, raised the dead, accepted worship and declared Himself one with the Father. His miracles were not merely displays of power but signs that God's kingdom had entered the world through Him.
The purpose of the Incarnation was not simply to teach or provide an example, although Christ certainly did both. He came to accomplish what humanity could never accomplish for itself. Through His perfect obedience, sacrificial death, victorious resurrection and glorious ascension, He defeated sin and death, reconciled humanity to God and opened the way to eternal life.
The Early Church consistently proclaimed that salvation is found in Christ because of who He is as well as what He has done. If He were only man, He could not save the world. If He were only God and not truly human, He could not heal human nature or stand in humanity's place. The mystery of the Incarnation is therefore at the very heart of the Gospel.
Jesus Christ is the God-Man, the eternal Son made flesh. In Him, God entered human history without ceasing to be God, so that humanity might be restored to communion with Him. As St. Athanasius famously wrote, "The Son of God became man so that we might become partakers of the divine life." This is the heart of God's saving plan and the foundation of Christian faith.
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