Adam Clarke's Commentary on the Bible

Verse 6 (Galatians 1:6)

I marvel that ye are so soon removed - It was a matter of wonder to the apostle that a people, so soundly converted to God, should have so soon made shipwreck of their faith. But mutability itself has not a more apt subject to work upon than the human heart; the alternate workings of different passions are continually either changing the character, or giving it a different colouring. Reason, not passion, the word of God, not the sayings of men, should alone be consulted in the concerns of our salvation.

From him that called you - The apostle seems here to mean himself. He called them into the grace of Christ; and they not only abandoned that grace, but their hearts became greatly estranged from him; so that, though at first they would have plucked out their eyes for him, they at last counted him their enemy, Galatians 4:14-16 .

Another gospel - It is certain that in the very earliest ages of the Christian Church there were several spurious gospels in circulation, and it was the multitude of these false or inaccurate relations that induced St. Luke to write his own. See Luke 1:1 . We have the names of more than seventy of these spurious narratives still on record, and in ancient writers many fragments of them remain; these have been collected and published by Fabricius, in his account of the apocryphal books of the New Testament, 3 vols. 8vo. In some of these gospels, the necessity of circumcision, and subjection to the Mosaic law in unity with the Gospel, were strongly inculcated. And to one of these the apostle seems to refer.

- Adam Clarke's Commentary on the Bible