Have ye suffered so many things? This is another argument. Having suffered so many things in behalf of the gospel, would they now, in an instant, lose it all? Nay, he puts it in the way of reproach, if they were willing to lose the advantage of so many illustrious struggles which they had made for the faith. If the true faith had not been delivered to them by Paul, it was rash to suffer anything in defense of a bad cause; but they had experienced the presence of God amidst their persecutions. Accordingly, he charges the false apostles with ill-will in depriving the Galatians of such valuable ornaments. But to mitigate the severity of this complaint, he adds, if it be yet in vain; thus inspiring their minds with the expectation of something better, and rousing them to the exercise of repentance. For the intention of all chastisement is, not to drive men to despair, but to lead them to a better course.

Have ye suffered so many things in vain? - Paul reminds them of what they had endured on account of their attachment to Christianity. He assures them, that if the opinions on account of which they had suffered were false, then their sufferings had been in vain. They were of no use to them - for what advantage was it to suffer for a false opinion? The opinions for which they had suffered had not been these which they now embraced. They were not those connected with the observance of the Jewish rites. They had suffered on account of their having embraced the gospel, the system of justification by a crucified Redeemer; and now, if those sentiments were wrong, why, their sufferings had been wholly in vain; see this argument pursued at much greater length in 1-Corinthians 15:18-19, 1-Corinthians 15:29-32. If it be yet in vain. That is, I trust it is not in vain. I hope you have not so far abandoned the gospel, that all your sufferings in its behalf have been of no avail. I believe the system is true; and if true, and you are sincere Christians, it will not he in vain that you have suffered in its behalf, though you have gone astray. I trust, that although your principles have been shaken, yet they have not been wholly overthrown, and that you will not reap the reward of your having suffered so much on account of the gospel.

Have ye suffered so many things in vain? - Have ye received and lost so much good? The verb πασχων, as compounded with ευ, well, or κακως, ill, and often without either, signifies to suffer pain or loss, or to possess and enjoy. In such a case the man is considered as the patient, and the good or ill acts upon him. Though it is possible that the Galatians had suffered some persecution for the truth of Christ, yet it is as likely that the apostle refers to the benefits which they had received. Ye have received faith, the pardon of your sins, the gift of the Holy Spirit, and with it many extraordinary gifts and graces; and have ye suffered the loss of all these things? Have ye received all these in vain? if yet in vain - if it be credible that ye have sacrificed so many excellent benefits for an imaginary good.

(3) Have ye suffered so many things in vain? if [it be] yet in vain.
(3) An exhortation by manner of reproach, so that they do not in vain suffer so many conflicts.

Have ye suffered so many things in vain?.... These Galatians had suffered great reproach, many afflictions and persecutions for the sake of the Gospel, as all that embrace it must expect to do; and which to them that persevere in the faith of the Gospel will not be in vain, they will be followed with eternal life and glory; not that these things are meritorious of such happiness, or deserve such a reward; the reward of them is not of debt, but of grace. But, if such who have made a profession, and have suffered for it, should after all relinquish it, their sufferings for it are in vain; they will come short of that glory which is promised to them that suffer for righteousness sake: and this is another aggravation of the folly of these persons, that they should suffer so much persecution for the Gospel, which, if not true, they must have suffered in vain, and might as well have avoided it; and, if true, by relinquishing it not only sustain a great loss, but bring great hurt and damage to themselves:
if it be yet in vain; by which words the apostle does, as it were, correct himself, and expresses his hope of them, that they would see their mistake, revoke their error, and abide by the truth of the Gospel.

Have ye suffered so many things--namely, persecution from Jews and from unbelieving fellow countrymen, incited by the Jews, at the time of your conversion.
in vain--fruitlessly, needlessly, since ye might have avoided them by professing Judaism [GROTIUS]. Or, shall ye, by falling from grace, lose the reward promised for all your sufferings, so that they shall be "in vain" (Galatians 4:11; 1-Corinthians 15:2, 1-Corinthians 15:17-19, 1-Corinthians 15:29-32; 2-Thessalonians 1:5-7; 2-John 1:8)?
yet--rather, "If it be really (or 'indeed') in vain" [ELLICOTT]. "If, as it must be, what I have said, 'in vain,' is really the fact" [ALFORD]. I prefer understanding it as a mitigation of the preceding words. I hope better things of you, for I trust you will return from legalism to grace; if so, as I confidently expect, you will not have "suffered so many things in vain" [ESTIUS]. For "God has given you the Spirit and has wrought mighty works among you" (Galatians 3:5; Hebrews 10:32-36) [BENGEL].

Have ye suffered - Both from the zealous Jews and from the heathens. So many things - For adhering to the gospel. In vain - So as to lose all the blessings which ye might have obtained, by enduring to the end. If it be yet in vain - As if he had said, I hope better things, even that ye will endure to the end.