Commentaries:
Robertson's Word Pictures (NT)
And hateth his brother (kai ton adelfon autou miswn). Sharp contrast between the love just described and hate. The only way to walk in the light (I John 1:7) is to have fellowship with God who is light (I John 1:3, I John 1:5). So the claim to be in the light is nullified by hating a brother.
Even until now (ewv arti). Up till this moment. In spite of the increasing light and his own boast he is in the dark.
Other Robertson's Word Pictures (NT) entries containing 1 John 2:9:
John 3:19
1 John 2:11
1 John 2:29
1 John 3:10
1 John 3:14
1 John 4:7
1 John 4:20
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