Despite the intelligibility of Paul's statement, our enemies fail to grasp it. Otherwise they would not emphasize free will, natural strength, the works of supererogation, etc. To escape the charge of forgery they always have their convenient annotation handy, that Paul is referring only to the ceremonial and not to the moral law. But Paul includes all laws. He expressly says: "If there had been a law given."
There is no law by which righteousness may be obtained, not a single one. Why not?
VERSE 22. But the Scripture hath concluded all under sin.
Where? First in the promises concerning Christ in Genesis 3:15 and in Genesis 22:18, which speak of the seed of the woman and the seed of Abraham. The fact that these promises were made unto the fathers concerning Christ implies that the fathers were subject to the curse of sin and eternal death. Otherwise why the need of promises?
Next, Holy Writ "concludes" all under sin in this passage from Paul: "For as many as are of the works of the law are under the curse." Again, in the passage which the Apostle quotes from Deuteronomy 27:26, "Cursed is every one that continueth not in all things which are written in the book of the law to do them." This passage clearly submits all men to the curse, not only those who sin openly against the Law, but also those who sincerely endeavor to perform the Law, inclusive of monks, friars, hermits, etc.
The conclusion is inevitable: Faith alone justified without works. If the Law itself cannot justify, much less can imperfect performance of the Law or the works of the Law, justify.
VERSE 22. That the promise by faith of Jesus Christ might be given to them that believe.
The Apostle stated before that "the Scripture hath concluded all under sin." Forever? No, only until the promise should be fulfilled. The promise, you will recall, is the inheritance itself or the blessing promised to Abraham, deliverance from the Law, sin, death, and the devil, and the free gift of grace, righteousness, salvation, and eternal life. This promise, says Paul, is not obtained by any merit, by any law, or by any work. This promise is given. To whom? To those who believe. In whom? In Jesus Christ.
VERSE 23. But before faith came.
The Apostle proceeds to explain the service which the Law is to render. Previously Paul had said that the Law was given to reveal the wrath and death of God upon all sinners. Although the Law kills, God brings good out of evil. He uses the Law to bring life. God saw that the universal illusion of self-righteousness could not be put down in any other way but by the Law. The Law dispels all self-illusions. It puts the fear of God in a man. Without this fear there can be no thirst for God's mercy. God accordingly uses the Law for a hammer to break up the illusion of self-righteousness, that we should despair of our own strength and efforts at self-justification.