10. In this verse is contained a tacit exhortation to embrace and retain the faith regarding Jesus Christ, which the Apostle has been proposing throughout this chapter, in refutation of the errors of the day, viz., that he is true God and true man, the Saviour and Mediator given by God to mankind—“he that believeth in the Son of God,” in the sense now explained, “hath the testimony of God in himself,” that is, firmly assents to what God testified, and thereby honours him by doing homage to his veracity.
1 John 5:10