For everyone who has been born of God overcomes the world. And this is the victory that has overcome the world—our faith. Who is it that overcomes the world except the one who believes that Jesus is the Son of God? ~ 1 John 5:4-5
Faith in Jesus Christ and dedication of one’s life to Him make a person an overcomer. John repeats the truth for emphasis.
The world is Satan’s worldwide system of deception and wickedness. 1 John 2:15. Through Christ and His provision of salvation, the believer is a victor (1 John 5:5) over the invisible system of demonic and human evil that Satan operates to capture people’s souls for hell. John repeats the reference to overcoming the world three times—to press it home. ~ MacArthur Bible Commentary
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