Jesus, the
The title declaring Jesus's unique divine sonship — confessed by Peter, declared by the Father at his baptism, and central to the Christian doctrine of the Trinity.
'Son of God' is the most theologically loaded title of Jesus. The phrase appears in several senses throughout Scripture — angels are called 'sons of God' (Job 1:6), kings of Israel were called God's son (Psalm 2:7), believers are called 'sons of God' (Romans 8:14) — but for Jesus the title means something unique. Jesus is not 'a' son of God but 'the' Son of God — the only-begotten (Greek monogenes — unique, one-of-a-kind), eternally generated from the Father, sharing the divine nature. The title appears at three key moments in the Gospels. (1) The annunciation. The angel told Mary: 'that holy thing which shall be born of thee shall be called the Son of God' (Luke 1:35). (2) Christ's baptism. The Father's voice from heaven: 'This is my beloved Son, in whom I am well pleased' (Matthew 3:17). (3) Peter's confession at Caesarea Philippi: 'Thou art the Christ, the Son of the living God' (Matthew 16:16). Jesus responded: 'Blessed art thou, Simon Bar-jona: for flesh and blood hath not revealed it unto thee, but my Father which is in heaven.' Recognizing Jesus as the Son of God is divine revelation, not human deduction. The title carries three dimensions. (1) Eternal sonship. Jesus is not a created being; he is eternally the Son of the Father. The Nicene Creed: 'eternally begotten of the Father, God from God, light from light, true God from true God, begotten not made, of one being with the Father.' (2) Incarnational sonship. The eternal Son took on human flesh in the womb of Mary. He is the Son of God become man — both fully God and fully man. (3) Messianic sonship. The Son of God is also the Messiah — the anointed king of Israel. Psalm 2 prophesied this: 'Thou art my Son; this day have I begotten thee... I shall give thee the heathen for thine inheritance.' To call Jesus the Son of God is therefore to confess his deity, his incarnation, and his messianic kingship in a single phrase. It is the heart of Christian confession.
“Thou art the Christ, the Son of the living God.”
Peter's confession at Caesarea Philippi
“This is my beloved Son, in whom I am well pleased.”
The Father's declaration at Christ's baptism
“For God so loved the world, that he gave his only begotten Son.”
“For unto which of the angels said he at any time, Thou art my Son, this day have I begotten thee?”
“We beheld his glory, the glory as of the only begotten of the Father.”
“The beginning of the gospel of Jesus Christ, the Son of God.”
To call Jesus 'Son of God' is to confess his full deity. He is not one religious teacher among many; he is the unique eternal Son of God become man. Christian faith is faith in this Son — not in his teaching alone but in his person. To trust Christ as Son of God is to trust the only person in human history who is qualified to save: fully God (so the saving work is divine) and fully human (so it counts for humanity).
When applied to Jesus, 'Son of God' means he is the eternal divine Son of the Father — the only-begotten, sharing the divine nature, both fully God and (in the Incarnation) fully human. The title is unique to Christ. Angels, kings, and believers are sometimes called 'sons of God' in various senses, but Jesus is THE Son in a way no one else is. The Nicene Creed: 'eternally begotten of the Father, God from God, light from light, true God from true God.'
Jesus is the unique Son of God in the highest sense — the only-begotten Son (Greek monogenes), eternally generated from the Father, sharing the divine nature. Christians are called 'sons of God' by adoption (Romans 8:15) through faith in Christ, but this is a different category: we become God's children by adoption; Jesus IS God's Son by eternal nature.
Jesus did not 'become' the Son of God at any point — he is eternally the Son. He existed as the Son before creation (John 1:1, John 17:5). At the Incarnation, the eternal Son took on human flesh (John 1:14). At his baptism, the Father publicly affirmed his sonship (Matthew 3:17). At his resurrection, his sonship was declared 'with power' (Romans 1:4) — confirmed and vindicated, but not begun.