Here he passes to another subject; in the former chapters he had shown himself not to be an Apostle of men, nor by men, nor in want of Apostolic instruction. Now, having established his authority as a teacher, he proceeds to discourse more confidently, and draws a comparison between faith and the Law. At the outset he said, “I marvel that ye are so quickly removing;” (Gal. i. 6.) but here, “O foolish Galatians;” then, his indignation was in its birth, but now, after his refutation of the charges against himself, and his proofs, it bursts forth. Let not his calling them “foolish” surprise you; for it is not a transgression of Christ’s command not to call one’s brother a fool, but rather a strict observance of it. For it is not said simply, “Whosoever shall say to his brother, Thou fool,” (Mat. v. 22.) but, whosoever shall do so, “without a cause.” And who more fittingly than they could so be called, who after so great events, adhered to past things, as if nothing else had ever happened? If on this account Paul is to be called a “reviler,” Peter may likewise, on account of Annanias and Sapphira, be called a homicide; but as it would be wildness to do so in that case, much more in this. Moreover it is to be considered, that this vehemence is not used at the beginning, but after these evidences and proofs, which, rather than Paul himself, might now be held to administer the rebuke. For after he had shown that they rejected the faith, and made the death of Christ to be without a purpose, he introduces his reproof, which, even as it is, is less severe than they merited. Observe too how soon he stays his arm; for he adds not, Who has seduced you? who has perverted you? who has been sophistical with you? but, “Who hath cast an envious eye on you?” thus tempering his reprimand with somewhat of praise. For it implies that their previous course had excited jealousy, and that the present occurrence arose from the malignity of a demon, whose breath had blasted their prosperous estate.