Expositor's Bible Commentary Commentary 1 John 2:10

"He that loveth his brother abideth in the light, and there is no occasion of stumbling in him." — 1 John 2:10 (ASV)

The author now gives us a positive test of living in the light. Unlike his opponents, his concern is with deeds, not claims. “Whoever loves,” he says, is “in the light.” Conversely, the one who does not live “in the light” will not manifest God’s love. The uncertain antecedents of the Greek pronouns leads to some ambiguity in the rest of the sentence. In view of the author’s aim, he is probably saying that the one who loves and abides in the light will never cause the offense the opponents do.