John declares that for a man to have eternal life he must
According to John, for a man to have eternal life, he must believe in the only Son of God. John emphasizes the importance of faith in Jesus Christ throughout his Gospel, and he repeatedly asserts that those who believe in Jesus will have eternal life. This belief is central to the Christian faith, as it is through faith in Jesus that one receives salvation and is reconciled with God. In John 3:16, it is written, "For God so loved the world that he gave his one and only Son, that whoever believes in him shall not perish but have eternal life." Therefore, according to John, eternal life is not something that can be earned through good works or religious observances, but it is a gift that is received by faith in Jesus Christ.