The Tenth Commandment forms a fitting conclusion to the law that God spoke at Sinai. It also shows you something about your relationship with God, as the apostle points out in 1 John 1:8–10.
Don’t claim to be without sin. God is light. The Word revealed this. Rather than quoting a specific saying of Jesus, John seems to be reflecting Jesus’ teaching about the Father. He sums it up in one sentence: “God is light.” Jesus, as the eternal Word, not only describes God as light, he is light, cf. John 1:4, 9, 14, 18; 8:12. God reveals himself as light. Light describes God’s character. This is one of a number of John’s brief statements about God: “God is love,” 1 John 4:8, 16; “God is Spirit,” John 4:24. “God is light” is not a comprehensive, exhaustive, definition of God (He is greater than our words or concepts), but is one of the ways that God describes himself. Why “light” to describe God? Light was the result of God’s first creative word. The shekinah cloud of glory led Israel through the desert. God clothes himself in light, Psalm 104:2. The promised Messiah would rise as the “sun of righteousness,” Malachi 4:2. Jesus proclaims himself “the light of the world,” John 8:12. God “lives in unapproachable light,” 1 Timothy 6:16. Because he is light, in him there is no darkness at all. God’s holiness is unqualified.
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