Jamieson, Fausset & Brown

faith--namely, that just mentioned (Gal 3:22), of which Christ is the object. kept--Greek, "kept in ward": the effect of the "shutting up" (Gal 3:22; Gal 4:2; Rom 7:6). unto--"with a view to the faith," &c. We were, in a manner, morally forced to it, so that there remained to us no refuge but faith. Compare the phrase, Psa 78:50, Margin; Psa 31:8. which should afterwards, &c.--"which was afterwards to be revealed."