In this dramatic fashion Paul shows how the Mosaic law by its ethical discipline prepared men for a life which by itself it was incapable of giving. Where Law has done its work well, it produces, as in the Apostle's earlier experience, a profound sense of personal demerit, a tenderness of conscience, a contrition of heart which makes one ready thankfully to receive "the righteousness which is of God by faith." In every age and condition of life a like effect is wrought upon men who honestly strive to live up to an exacting moral standard. They confess their failure. They lose self-conceit. They grow "poor in spirit," willing to accept "the abundance of _the gift_ of righteousness" in Jesus Christ.
_Faith_ is trebly honoured here. It is the condition of the gift, the characteristic of its recipient (vv. 22, 24), and the end for which he was put under the charge of Law (ver. 23). "To them that believe" is "given," as it was in foretaste to Abraham (ver. 6), a righteousness unearned, and bestowed on Christ's account (ch. iii. 13; Rom. v. 17, 18); which brings with it the indwelling of the Holy Spirit, reserved in its conscious possession for Abraham's children in the faith of Christ (ch. iii. 14; iv. 4). These blessings form the commencement of that true life, whose root is a spiritual union with Christ, and which reaches on to eternity (ch. ii. 20; Rom. v. 21; vi. 23). Of such life the Law could impart nothing; but it taught men their need of it, and disposed them to accept it. This was the purpose of its institution. It was the forerunner, not the finisher, of Faith.
2. Paul makes use of a second figure to describe the office of the Law; under which he gives his final answer to the question of ver. 19. The metaphor of the gaoler is exchanged for that of _the tutor_. "The law hath been our =paidagôgos= for Christ." This Greek word (_boy-leader_) has no English equivalent; we have not the thing it represents. The "pedagogue" was a sort of nursery governor,--a confidential servant in the Greek household, commonly a slave, who had charge of the boy from his infancy, and was responsible for his oversight. In his food, his clothes, his home-lessons, his play, his walks--at every point the pedagogue was required to wait upon his young charge, and to control his movements. Amongst other offices, his tutor might have to conduct the boy to school; and it has been supposed that Paul is thinking of this duty, as though he meant, "The Law has been our pedagogue, to take us to Christ, our true teacher." But he adds, "That we might be justified of faith." The "tutor" of ver. 24 is parallel to the "guard" of the last verse; he represents a distinctly disciplinary influence.