1-john 5:1

Whosoever believeth, etc. - Expressions of this kind are to be taken in connection with the subjects necessarily implied in them. He that believeth that Jesus is the Messiah, and confides in him for the remission of sins, is begotten of God; and they who are pardoned and begotten of God love him in return for his love, and love all those who are his children.

Whosoever believeth that Jesus is the Christ - Is the Messiah; the anointed of God. On the meaning of the word Christ, see the notes at Matthew 1:1. Of course, it is meant here that the proposition, that "Jesus is the Christ," should be believed or received in the true and proper sense, in order to furnish evidence that anyone is born of God. Compare the notes at 1 John 4:3. It cannot be supposed that a mere intellectual acknowledgment of the proposition that Jesus is the Messiah is all that is meant, for that is not the proper meaning of the word believe in the Scriptures. That word, in its just sense, implies that the truth which is believed should make its fair and legitimate impression on the mind, or that we should feel and act as if it were true. See the notes at Mark 16:16. If, in the proper sense of the phrase, a man does believe that Jesus "is the Christ," receiving him as he is revealed as the Anointed of God, and a Saviour, it is undoubtedly true that that constitutes him a Christian, for that is what is required of a man in order that he may be saved. See the notes at Acts 8:37.

Is born of God - Or rather, "is begotten of God." See the notes at John 3:3

And everyone that loveth him that begat - That loves that God who has thus begotten those whom he has received as his children, and to whom he sustains the endearing relation of Father.

Loveth him also that is begotten of him - That is, he will love all the true children of God; all Christians. See the notes at 1 John 4:20. The general idea is, that as all Christians are the children of the same Father; as they constitute one family; as they all bear the same image; as they share his favor alike; as they are under the same obligation of gratitude to him, and are bound to promote the same common cause, and are to dwell together in the same home forever, they should therefore love one another. As all the children in a family love their common father, so it should be in the great family of which God is the Head.

5:1 The scope and sum of this whole paragraph appears from the conclusion of it, 1 John 5:13: "These things have I written to you who believe, that ye may know that ye who believe have eternal life." So faith is the first and last point with St. John also. Every one who loveth - God that begat loveth him also that is begotten of him - Hath a natural affection to all his brethren.