The Gospel of John, as a whole, was written as an evangelistic treatise to persuade people to believe in Jesus for eternal life. The apostle John was an eyewitness to the life, death, burial, and resurrection of Jesus. Like other eyewitness accounts (Matthew, Mark, and Luke), John documented the historical events of the Messiah. John states the purpose for his Gospel, saying, “Therefore many other signs Jesus also performed in the presence of the disciples, which are not written in this book; but these have been written so that you may believe that Jesus is the Christ, the Son of God; and that by believing you may have life in His name” (John 20:31).[1] What John recorded is historically accurate and sufficient to lead someone to believe in Jesus as the Christ, the Son of God and, by believing in Him, to receive eternal life. That’s good news!
Scripture indicates that God requires certain information to be believed before He saves someone. To believe is to have a mental conviction that a testimony is true or that someone is reliable and worthy of confidence. Faith, then, is closely tied to the authority and reliability of the source. By faith, we accept information because we trust the source, and the Gospel of John is a reliable source of information about Jesus. John reveals that Jesus—prior to His incarnation—eternally existed as God (John 1:1-2; 8:58; 17:5), and that He is separate from God the Father (John 1:1; 17:24) and God the Holy Spirit (John 14:16-17; 15:26). John also tells us that God the Son added humanity to Himself, becoming the God-Man (John 1:1, 14, 18). Furthermore, John declares that Jesus came to deal with the sin of the world (John 1:29) and that He died for our sins, was buried, and rose again on the third day (John 19:1–20:29). After His resurrection, Jesus appeared physically alive to Mary Magdalene (John 20:11-18) and later to His disciples (John 20:19-29). Jesus’ resurrection validates His victory over sin and death (Paul also tells us that many other eyewitnesses saw Jesus after His resurrection; see 1 Cor 15:3-8).
The word “believe” (pisteuō) appears approximately 98 times in John’s Gospel, depending on the translation, making it more frequent than in any other New Testament book. This reflects John’s central purpose: to encourage belief in Jesus as the Christ and the Son of God for eternal life (John 20:31). Interestingly, John uses the verb “believe” but not the noun “faith” (pistis), focusing on active trust in Christ. This highlights the personal nature of saving faith as a response to the revelation of Jesus in His words and works. To be saved, each person must exercise their own faith and believe in Jesus as Savior.
Interestingly, John does not use the word “repent” (metanoeō) in his Gospel. Repentance means a “change of mind,” which is inherently included in the act of believing. To believe in Jesus as the Christ and the Son of God involves a shift from unbelief or misplaced trust to reliance on Jesus alone for salvation. Saving faith necessitates turning away from prior unbelief or false ideas about God and turning to faith alone in Christ alone. Ethical reform or moral transformation are not prerequisites for salvation. Jesus’ work on the cross is the sole basis for salvation (John 19:30). By focusing on belief, John simplifies the message for his audience, ensuring the clarity of the gospel of grace.
According to John, eternal salvation is exclusively found in Jesus, who said, “I am the way, and the truth, and the life; no one comes to the Father but through Me” (John 14:6). Eternal life, as recorded by John, is available to everyone (John 3:16; 4:14; 5:24; 6:47; 12:32), is promised to those who place their faith in Jesus as Savior (John 3:16; 20:30-31), and, once received, cannot be lost (John 10:28-29). John wrote, “For God so loved the world, that He gave His only begotten Son, that whoever believes in Him shall not perish, but have eternal life” (John 3:16), and “The one who believes in the Son has eternal life, but the one who refuses to believe in the Son will not see life; instead, the wrath of God remains on him” (John 3:36). This theme of faith alone in Christ alone runs throughout the Gospel, with repeated affirmations that belief in Jesus is the means by which sinners are saved and receive the gift of eternal life (John 5:24, 39-40; 6:40, 47; 10:27-28; 11:25-26; 20:31).
In conclusion, the Gospel of John provides a clear and compelling account of the person and work of Jesus Christ, emphasizing that belief in Him is the means by which we receive eternal life. John’s testimony, grounded in his own eyewitness experience (as one among many), assures us that Jesus is the eternal Son of God who became incarnate to offer salvation through His death, burial, and resurrection. By focusing on the act of believing, John simplifies the message, making it accessible to all who are willing to trust in Jesus as the Savior. When we believe in Jesus, we acknowledge that He is the incarnate Son of God (John 1:1, 14), that our salvation was accomplished through His death, burial, and resurrection (John 19:1–20:29; cf. 1 Cor 15:3-4), and we believe in Him alone for eternal life (John 3:16; 20:31).
Dr. Steven R. Cook
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[1] The Gospel of John records seven signs (miracles) that reveal Jesus’ identity as the Son of God and are meant to lead people to faith in Him for eternal life (John 20:30-31). The first sign is turning water into wine at the wedding in Cana, demonstrating Jesus’ power over nature and His role as the source of true joy (John 2:1-11). The second is healing the official’s son, which shows Jesus’ authority to heal from a distance, emphasizing the power of faith in His word (John 4:46-54). The third is healing the lame man at Bethesda, revealing Jesus’ power over sickness and His authority over the Sabbath (John 5:1-15). The fourth is feeding the 5,000, which displays Jesus as the Bread of Life who provides both spiritual and physical sustenance (John 6:1-14). The fifth is walking on water, demonstrating Jesus’ power over creation and His divine authority (John 6:16-21). The sixth is healing the man born blind, illustrating Jesus as the Light of the World who gives both physical and spiritual sight (John 9:1-41). The seventh and climactic sign is raising Lazarus from the dead, proving Jesus’ power over death and foreshadowing His own resurrection (John 11:1-44). Each of these signs points to Jesus’ divine nature and serves to persuade people to believe in Him for eternal life. While John also includes sections of deeper teaching for disciples (e.g., the Upper Room Discourse in John 13–17), these passages still fit within his broader evangelistic purpose, as they reveal Jesus’ identity, mission, and the promise of eternal life to those who believe. John also records Jesus’ “I am” statements, such as “I am the bread of life” (John 6:35), “I am the light of the world” (John 8:12), and “I am the resurrection and the life” (John 11:25), which underscore His unique identity and mission to bring spiritual life to those who believe in Him.
This is so clear and helpful. Many thanks, Steven. God bless you.
Thanks friend.