Commentaries:
Jamieson, Fausset, and Brown
There is no mean between light and darkness, love and hatred, life and death, God and the world: wherever spiritual life is, however weak, there darkness and death no longer reign, and love supplants hatred; and Luke 9:50 holds good: wherever life is not, there death, darkness, the flesh, the world, and hatred, however glossed over and hidden from man's observation, prevail; and Luke 11:23 holds good. "Where love is not, there hatred is; for the heart cannot remain a void" [BENGEL].
in the light—as his proper element.
his brother—his neighbor, and especially those of the Christian brotherhood. The very title "brother" is a reason why love should be exercised.
even until now—notwithstanding that "the true light already has begun to shine" (I John 2:8).
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