This discourse is most studiously and observably interwoven, of these two great things, mentioned 1 John 3:23, faith in the Messiah, and the love of one another, as being the principal antidotes against the poisonous insinuations of the apostates. Of confessing: See Poole on "1 John 4:2".
Related Commentaries of 1 John 4:15
1 John 4:15
15 Whosoever shall confess that Jesus is the Son of God, God dwelleth in him, and he in God.