The Pulpit Commentary - 1 John 3:10
The question whether "in this" ἐν τούτῳ refers to what precedes or to what follows is here unimportant, for both are similar in meaning; and "in this" may refer to both. "By their fruits ye shall know them." The children of God do righteousness, and not sin; the children of the devil do sin, and not righteousness. Of course, moral parentage is meant in both cases. Nothing here lends any countenance to the view that the writer is a dualist and inculcates two principles of existence—God... read more
The Pulpit Commentary - 1 John 3:9-12
Sin is absolutely incompatible with being born of God, as is shown by the presence or absence of brotherly love. read more