In this chapter the apostle says that he withstood the false teaching which was now misleading the Galatian brethren, in order that “the truth of the Gospel” might remain with them. Compare this with his introduction, in the first chapter, and his vehement assertions concerning the Gospel which he had preached to them, and his astonishment that they were now forsaking it, and it will be self-evident that the epistle must contain nothing else but the Gospel in the most forcible form of expression. Many have misunderstood it, and have derived no personal gain from it, because they have thought that it was but a contribution to the “strivings about the law,” against which Paul himself warned the brethren. GTI 67.1