Christ is become of no effect unto you, whosoever of you are justified by the law; you are fallen from grace.
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Augustine of Hippo
AD 430
Because it is they, not Christ, who are injured, he adds: “you have fallen from grace.” For when the effect of Christ’s grace is that those who were debtors to the works of the law were freed from this debt, these people, ungrateful to such great grace, prefer to be debtors to the whole law. Now this had not yet happened, but, because the will had begun to be moved, he therefore speaks frequently as though it had already happened.
Christ is become of no effect unto you. You are outside the redemption wrought by Christ, deprived of His merits, and void of His grace.
Whosoever of you are justified by the law. Who seek for righteousness from circumcision and other legal rites. By distrusting the grace of Christ and preferring the law, you have treated Christ with ingratitude, and in consequence He has withdrawn His grace from you. The Galatians , says S. Paul, were once filled with the grace of Christ, like a well with water; but they have now emptied it all out, and so lost the fruits of His Passion. Or, to put it in another way, Christ has emptied His Church of them, because of their want of faith. [Note.—The Vulgate rendering here is evacuati estis.]
Vatablus [as A.V.] interprets the term to mean that Christ had become of no effect, His labour had been thrown away, His Passion made fruitless by the withdrawal of His grace. The very name of Christian was no longer due to them, and should be dropped; or if they ...
All the virtue of the one who believes in Christ is by the grace of God. Grace is not from merits but from readiness to believe God. Therefore [Paul writes] “You have already fallen from grace if you place your justification in the law, because (for example) you serve works, because you observe the sabbath or on account of your circumcision. If you believe that you are justified by this, “you have fallen from grace and been made void of Christ.” You no longer have your faith from Christ nor hope for grace for yourselves from his passion and resurrection, if you believe that justification comes from the law.” .
If you think that justice cannot be obtained but under the law, you make a renunciation of the justice of Christ: his mediation becomes of no avail to you. (Calmet)
He is refuting those who believed that they were justified in the law, not those who observed its legitimate provisions in honor of him by whom they were commanded, understanding both that they were commanded as a foreshadowing of the truth and that they belonged to a particular time. .
Having established his point, he at length declares their danger of the severest punishment. When a man recurs to the Law, which cannot save him, and falls from grace, what remains but an inexorable retribution, the Law being powerless, and grace rejecting him?
Thus having aggravated their alarm, and disquieted their mind, and shown them all the shipwreck they were about to suffer, he opens to them the haven of grace which was near at hand. This is ever his wont, and he shows that in this quarter salvation is easy and secure,
