Jamieson, Fausset and Brown on 1 John 5:1

CHAPTER 5

1Jo 5:1-21. Who Are the Brethren Especially to Be Loved (1Jo 4:21); Obedience, the Test of Love, Easy through Faith, which Overcomes the World. Last Portion of the Epistle. The Spirit's Witness to the Believer's Spiritual Life. Truths Repeated at the Close: Farewell Warning.

1. Reason why our "brother" (1Jo 4:21) is entitled to such love, namely, because he is "born (begotten) of God": so that if we want to show our love to God, we must show it to God's visible representative.

Whosoever--Greek, "Everyone that." He could not be our "Jesus" (God-Saviour) unless He were "the Christ"; for He could not reveal the way of salvation, except He were a prophet: He could not work out that salvation, except He were a priest: He could not confer that salvation upon us, except He were a king: He could not be prophet, priest, and king, except He were the Christ [Pearson, Exposition of the Creed].

born--Translate, "begotten," as in the latter part of the verse, the Greek being the same. Christ is the "only-begotten Son" by generation; we become begotten sons of God by regeneration and adoption.

every one that loveth him that begat--sincerely, not in mere profession (1Jo 4:20).

loveth him also that is begotten of him--namely, "his brethren" (1Jo 4:21).