So little indeed is faith conceived as containing in itself the energy or ground of salvation, that it is consistently represented as, in its origin, itself a gratuity from God in the prosecution of His saving work. It comes, not of one’s own strength or virtue, but only to those who are chosen of God for its reception (II Thess. ii. 13), and hence is His gift (Eph. vi. 23, cf. ii. 8, 9, Phil, i. 29), through Christ (Acts iii. 16, Phil. i. 29, I Pet. i. 21, cf. Heb. xii. 2), by the Spirit (II Cor. iv. 13, Gal. v. 5), by means of the preached word (Rom. x. 17, Gal. iii. 2, 5); and as it is thus obtained from God (II Pet. i. 1, Jude 3,1 Pet. i. 21), thanks are to be returned to God for it (Col. i. 4, II Thess. i. 3). Thus, even here all boasting is excluded, and salvation is conceived in all its elements as the pure product of unalloyed grace, issuing not from, but in, good works (Eph. ii. 8-12). The place of faith in the process of salvation, as biblically conceived, could scarcely, therefore, be better described than by the use of the scholastic term ‘instrumental cause.’ Not in one portion of the Scriptures alone, but throughout their whole extent, it is conceived as a boon from above which comes to men, no doubt through the channels of their own activities, but not as if it were an effect of their energies, but rather, as it has been finely phrased, as a gift which God lays in the lap of the soul. ‘With the heart,’ indeed, ‘man believeth unto righteousness’; but this believing does not arise of itself out of any heart indifferently, nor is it grounded in the heart’s own potencies; it is grounded rather in the freely-giving goodness of God, and comes to man as a benefaction out of heaven.
The effects of faith, not being the immediate product of faith itself but of that energy of God which was exhibited in raising Jesus from the dead and on which dependence is now placed for raising us with Him into newness of life (Col. ii. 12), would seem to depend directly only on the fact of faith, leaving questions of its strength, quality, and the like more or less to one side. We find a proportion, indeed, suggested between faith and its effects (Mt. ix. 29, viii. 13, cf. viii. 10, xv. 28, xvii. 20, Lk. vii. 9, xvii. 6). Certainly there is a fatal doubt, which vitiates with its double-mindedness every approach to God (Jas. i. 6-8, cf. iv. 8, Mt. xxi. 21, Mk. xi. 23, Rom. iv. 20, xiv. 23, Jude 22). But Jesus deals with notable tenderness with those of ‘little faith,’ and His apostles imitated Him in this (Mt. vi. 30 f., 20, xiv. 31, xvi. 8, xvii. 20, Lk. xii. 28, Mk. ix. 24, Lk. xvii. 5, cf. Rom. xiv. 1, 2,1 Cor. viii. 7, and see Doubt). The effects of faith may possibly vary also with the end for which the trust is exercised (cf. Mk. x. hi ha ava(3\e\f/w with Gal. ii. 16 â‚¬7rioTeu-cranev ha 5t/catoj0w/xey). But he who humbly but confidently casts himself on the God of salvation has the assurance that he shall not be put to shame (Rom. xi. 11, ix. 33), but shall receive the end of his faith, even the salvation of his soul (I Pet. i. 9). This salvation is no doubt, in its idea, received all at once (Jn. iii. 36, I Jn. v. 12); but it is in its very nature a process, and its stages come, each in its order. First of all, the believer, renouncing by the very act of faith his own righteousness which is out of the law, receives that ‘righteousness which is through faith in Christ, the righteousness which is from God on faith’ (Phil, iii. 9, cf. Rom. iii. 22, iv. 11, ix. 30, x. 3, 10, II Cor. v. 21, Gal. v. 5, Heb. xi. 7, II Pet. i. 1). On the ground of this righteousness, which in its origin is the ‘ righteous act’ of Christ, constituted by His ‘obedience’ (Rom. v. 18, 19), and comes to the believer as a ‘ gift’ (Rom. v. 17), being reckoned to him apart from works (Rom. iv. 6), he that believes in Christ is justified in God’s sight, received into His favour, and made the recipient of the Holy Spirit (Jn. vii. 39, cf. Acts v. 32), by whose indwelling men are constituted the sons of God (Rom. viii. 13). And if children, then are they heirs (Rom. viii. 17), assured of an incorruptible, undefiled, and unfading inheritance, reserved in heaven for them; and meanwhile they are guarded by the power of God through faith unto this gloriously complete salvation (I Pet. i. 4, 5). Thus, though the immediate effect of faith is only to make the believer possessor before the judgment-seat of God of the alien righteousness wrought out by Christ, through this one effect it draws in its train the whole series of saving acts of God, and of saving effects on the soul. Being justified by faith, the enmity which has existed between the sinner and God has been abolished, and he has been introduced into the very family of God, and made sharer in all the blessings of His house (Eph. ii. 13 f.). Being justified by faith, he has peace with God, and rejoices in the hope of the glory of God, and is enabled to meet the trials of life, not merely with patience but with joy (Rom. v. 1 f.). Being justified by faith, he has already working within him the life which the Son has brought into the world, and by which, through the operations of the Spirit which those who believe in Him receive (Jn. vii. 39), he is enabled to overcome the world lying in the evil one, and, kept by God from the evil one, to sin not (I Jn. v. 19). In a word, because we are justified by faith, we are, through faith, endowed with all the privileges and supplied with all the graces of the children of God.
B.B. Warfield. Biblical Doctrines (Kindle Locations 7543-7580). Monergism Books. Kindle Edition.