The Gospel of John presents Jesus as the divine Son of God, the Word incarnate, focusing on his identity and purpose through 'signs' (miracles) and 'I Am' statements, leading to belief for eternal life, culminating in his Passion and Resurrection. First John, traditionally by the same author, emphasizes Christian love, fellowship with God, righteous living as evidence of faith, and discerning truth from falsehood, contrasting believers with the world. Both works aim to strengthen faith in Jesus as the Messiah, offering assurance of life and God's presence.