The Eternal Sonship of Christ refers to the doctrine that Jesus Christ, as the Son of God, has existed eternally with the Father, sharing in the divine nature and attributes. This concept is rooted in biblical passages such as Hebrews 1:2-3, which describes Christ as the "radiance of God's glory" and the "exact representation of his being," and John 1:1-14, which portrays Jesus as the eternal Word who was with God in the beginning. Additionally, Psalms 2:7 emphasizes the Father's declaration to the Son, "You are my Son; today I have become your Father," highlighting their eternal relationship. The Eternal Sonship of Christ is a fundamental aspect of Christian theology, underscoring the unique and intimate bond between the Father and the Son, as seen in Jesus' statement in John 17:5, where he prays to the Father to glorify him with the glory they shared before the world existed.
John Gill discusses the doctrine of the eternal Sonship of Christ, asserting that Jesus is the Son of God by eternal generation, existing as such before His incarnation. He highlights the historical opposition to this doctrine from various heretics throughout Christian history, including Simon Magus