He that loveth his brother abideth in the light, and there is none occasion of stumbling in him. He that loveth his brother abideth in the light, and there is none occasion of stumbling in him.
Abiding in love is abiding in the light; for Gospel light not only illumines the understanding, but warms the heart.
None occasion of stumbling - in contrast to 1 John 2:11.
'In him who loves there is neither blindness nor occasion of stumbling (to himself): in him who does not love, there in both. He who hates his brother stumbles against himself and everything within and without: he who loves has an unimpeded path' (Bengel). John has in mind Jesus' words, John 11:9-10. 'The light and the darkness are within; admitted into us by the eye, whose singleness fills the whole body with light' (Alford).