The Gospel of John is written to reveal the glory of Jesus Christ as the Son of God, that by believing in Him, one might possess eternal life. It presents Christ as the eternal Word made flesh, the fulfillment of the Law, and the only mediator who grants life to whom He wills.
The Gospel of John introduces Christ not merely as a prophet, but as the eternal Word who was with God and was God. In a display of divine grace, this eternal Word became flesh to dwell among us, manifesting the glory of the Father, full of grace and truth. As noted in John 1:1, the identity of Christ is rooted in His eternal pre-existence, standing as the Creator of all things who has come to bring light to a fallen world.
The entire purpose of John’s witness is soteriological: it is written that we may believe that Jesus is the Christ, the Son of God, and find life in His name (John 20:30-31). This Gospel highlights that the Son possesses the authority to grant life to whom He wishes, bridging the chasm between death and eternal life for those who believe. It is a reminder that we are more sinful than we dared believe, yet our acceptance is found entirely in the finished work of Him who has passed from death to life on our behalf (John 5:21-24).