Галатам 3:21

"Is the law (which involves a mediator) against the promises of God (which are without a mediator, and rest on God alone and immediately)? God forbid." life--The law, as an externally prescribed rule, can never internally impart spiritual life to men naturally dead in sin, and change the disposition. If the law had been a law capable of giving life, "verily (in very reality, and not in the mere fancy of legalists) righteousness would have been by the law (for where life is, there righteousness, its condition, must also be)." But the law does not pretend to give life, and therefore not righteousness; so there is no opposition between the law and the promise. Righteousness can only come through the promise to Abraham, and through its fulfilment in the Gospel of grace.

The apostle in this chapter, I. Reproves the Galatians for their folly, in suffering themselves to be drawn away from the faith of the gospel, and endeavours, from several considerations, to impress them with a sense of it. II. He proves the doctrine which he had reproved them for departing from - that of justification by faith without the works of the law, 1. From the example of Abraham's justification. 2. From the nature and tenour of the law. 3. From the express testimony of the Old Testament; and, 4. From the stability of the covenant of God with Abraham. Lest any should hereupon say, "Wherefore then serveth the law?" he answers, (1.) It was added because of transgressions. (2.) It was given to convince the world of the necessity of a Saviour. (3.) It was designed as a schoolmaster, to bring us to Christ. And then he concludes the chapter by acquainting us with the privilege of Christians under the gospel state.

3:21-25 See Rom 7:7-13. 3:21 No conflict of purpose exists between law and promise, or between law and faith. Law partners with the promise in bringing people to faith in Christ. Law has its proper roles of declaring people prisoners of sin (3:19, 22) and of restraining sin (3:23-25). In Galatia, the Judaizers tried to convince Gentile Christians that the law could do something it was never intended to do—give . . . new life and make people right with God. God does these things on the basis of faith in his promise, which was fulfilled in Jesus Christ (see 3:22).