Галатам 3:4

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" (Gal 4:11; Co1 15:2, Co1 15:17-19, Co1 15:29-32; Th2 1:5-7; Jo2 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" (Gal 3:5; Heb 10:32-36) [BENGEL].

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.

3:4 Have you experienced (or suffered) so much for nothing? This could refer to suffering, but what is known about the Galatian church does not suggest this. Paul was probably referring to the spiritual experiences the Galatians had through the Holy Spirit (Gal 3:3, 5). Turning to the law for right standing with God would mean regarding the work of the Spirit as meaningless.