John writes to remind believers of their eternal life, encouraging them to continue in their faith and love for God and His people. He explains that faith, love, and obedience are marks of a true believer, and that the Holy Spirit bears witness to this truth. John also addresses the issue of Gnosticism, refuting the false doctrine that Jesus was not physical but only spiritual. He emphasizes the importance of standing in victory and keeping oneself from idols, which can distract us from our relationship with God.
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