Jamieson, Fausset & Brown

For--rather, a proof that this is an evident token from God of your salvation, "Because," &c. it is given--Greek, "it has been granted as a favor," or "gift of grace." Faith is the gift of God (Eph 2:8), not wrought in the soul by the will of man, but by the Holy Ghost (Joh 1:12-13). believe on him--"To believe Him," would merely mean to believe He speaks the truth. "To believe on Him," is to believe in, and trust through, Him to obtain eternal salvation. Suffering for Christ is not only not a mark of God's anger, but a gift of His grace.