1 John 5
Everyone who believes that Jesus is the Christ is born of God, and this faith constitutes the overcoming victory that conquers the world—the spiritual reality that believing in Jesus marks the believer as one who belongs to God's family. The three witnesses to Jesus as the Son of God—the Spirit, the water, and the blood—testify to his identity: the Spirit witnesses to his divinity, the water to his baptism, and the blood to his sacrificial death and atonement. God has given us eternal life, and this life is in his Son; therefore those who have the Son have life, and those without the Son do not have life, establishing an absolute alternative between eternal relationship with God and spiritual death. The things written in this letter aim at producing certainty (eidēte—to know) that you have eternal life, moving believers from uncertainty and doubt to confident assurance of their standing before God. The confidence of prayer according to his will—asking anything in accordance with God's desire for believers' transformation—receives assurance of being heard and answered. Keeping oneself from idols and maintaining exclusive devotion to the true God guards the faith from the subtle idolatries that infiltrate communities and hearts.
1 John 5:17
All wrongdoing is sin, but there is sin that does not lead to death — the graduated perspective acknowledges sin's universality while distinguishing degrees of severity. The sin-not-unto-death is remediable through repentance and prayer. The frame suggests pastoral hope for most fallenness.
1 John 5:18
We know that anyone born of God does not keep on sinning, but he who was born of God protects him, and the evil one does not touch him — the born-of-God (gennao ek theos) do not persist in sin. Protection (tēreō) from the evil one (ho poneros) is divine function. Spiritual security is grounded in Christ's intercession.
1 John 5:19
We know that we are from God, and the whole world lies in the power of the evil one — the contrast (de) between believers' divine origin and the world's captivity is absolute. The world (holos kosmos) remains under the evil one's dominion (keitai en tō poneró). Yet believers escape this power through Christ.
1 John 5:20
And we know that the Son of God has come and has given us understanding, so that we know him who is true. And we are in him who is true, in his Son Jesus Christ. He is the true God and eternal life — the coming (hēkō) of the Son established access to divine knowledge. Understanding (dianoia) permits recognition of the true God. The final identification of Christ as the true God (theos) is explicitly christological.
1 John 5:21
Little children, keep yourselves from idols — the final exhortation warns against turning from the true God to false gods. Idolatry (eidōlon) represents the quintessential infidelity. The closing mirrors the beginning: fellowship with the Father and Son excludes the worship of anything else.