Commentaries:
Jamieson, Fausset, and Brown
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; I Corinthians 15:2, I Corinthians 15:17-19, I Corinthians 15:29-32; II Thessalonians 1:5-7; II 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].
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