{And hateth his brother} (kai ton adelphon autou mis(936e)).
Sharp contrast between the love just described and hate. The only
way to walk in the light ( 1:7 ) is to have fellowship with God
who is light ( 1:3,5 ). So the claim to be in the light is
nullified by hating a brother. {Even until now} (he(9373) arti). Up
till this moment. In spite of the increasing light and his own
boast he is in the dark.