5:7-12 The life of a Christian is a race, wherein he must run, and hold on, if he would obtain the prize. It is not enough that we profess Christianity, but we must run well, by living up to that profession. Many who set out fairly in religion, are hindered in their progress, or turn out of the way. It concerns those who begin to turn out of the way, or to tire in it, seriously to inquire what hinders them. The opinion or persuasion, ver. 8, was, no doubt, that of mixing the works of the law with faith in Christ in justification. The apostle leaves them to judge whence it must arise, but sufficiently shows that it could be owing to none but Satan. It is dangerous for Christian churches to encourage those who follow, but especially who spread, destructive errors. And in reproving sin and error, we should always distinguish between the leaders and the led. The Jews were offended, because Christ was preached as the only salvation for sinners. If Paul and others would have admitted that the observance of the law of Moses was to be joined with faith in Christ, as necessary to salvation, then believers might have avoided many of the sufferings they underwent. The first beginnings of such leaven should be opposed. And assuredly those who persist in disturbing the church of Christ must bear their judgment.
11. Translate, "If I am still preaching (as I did before conversion) circumcision, why am I still persecuted?" The Judaizing troubler of the Galatians had said, "Paul himself preaches circumcision," as is shown by his having circumcised Timothy (Ac 16:3; compare also Ac 20:6; 21:24). Paul replies by anticipation of their objection, As regards myself, the fact that I am still persecuted by the Jews shows plainly that I do not preach circumcision; for it is just because I preach Christ crucified, and not the Mosaic law, as the sole ground of justification, that they persecute me. If for conciliation he lived as a Jew among the Jews, it was in accordance with his principle enunciated (1Co 7:18, 20; 9:20). Circumcision, or uncircumcision, are things indifferent in themselves: their lawfulness or unlawfulness depends on the animus of him who uses them. The Gentile Galatians' animus in circumcision could only be their supposition that it influenced favorably their standing before God. Paul's living as a Gentile among Gentiles, plainly showed that, if he lived as a Jew among Jews, it was not that he thought it meritorious before God, but as a matter indifferent, wherein he might lawfully conform as a Jew by birth to those with whom he was, in order to put no needless stumbling-block to the Gospel in the way of his countrymen.
then—Presuming that I did so, "then," in that case, "the offense of (stumbling-block, 1Co 1:23 occasioned to the Jews by) the cross has become done away." Thus the Jews' accusation against Stephen was not that he preached Christ crucified, but that "he spake blasphemous words against this holy place and the law." They would, in some measure, have borne the former, if he had mixed with it justification in part by circumcision and the law, and if he had, through the medium of Christianity, brought converts to Judaism. But if justification in any degree depended on legal ordinances, Christ's crucifixion in that degree was unnecessary, and could profit nothing (Ga 5:2, 4). Worldly Wiseman, of the town of Carnal Policy, turns Christian out of the narrow way of the Cross, to the house of Legality. But the way to it was up a mountain, which, as Christian advanced, threatened to fall on him and crush him, amidst flashes of lightning from the mountain [Bunyan, Pilgrim's Progress] (Heb 12:18-21).