1:1 Paul, an apostle - Here it was necessary for St. Paul to assert his authority; otherwise he is very modest in the use of this title. He seldom mentions it when he mentions others in the salutations with himself, as in the Epistles to the Philippians and Thessalonians; or when he writes about secular affairs, as in that to Philemon; nor yet in writing to the Hebrews because he was not properly their apostle. Not of men - Not commissioned from them, but from God the Father. Neither by man - Neither by any man as an instrument, but by Jesus Christ. Who raised him from the dead - Of which it was the peculiar business of an apostle to bear witness.

Galatians 1:1 Parallel Commentaries

The Praise of Men.
"They loved the praise of men more than the praise of God."--John xii. 43. This is spoken of the chief rulers of the Jews, who, though they believed in Christ's Divine mission, were afraid to confess Him, lest they should incur temporal loss and shame from the Pharisees. The censure passed by St. John on these persons is too often applicable to Christians at the present day; perhaps, indeed, there is no one among us who has not at some time or other fallen under it. We love the good opinion …
John Henry Newman—Parochial and Plain Sermons, Vol. VII

Sudden Conversions.
"By the grace of God I am what I am: and His grace which was bestowed upon me was not in vain."--1 Cor. xv. 10. We can hardly conceive that grace, such as that given to the great Apostle who speaks in the text, would have been given in vain; that is, we should not expect that it would have been given, had it been foreseen and designed by the Almighty Giver that it would have been in vain. By which I do not mean, of course, to deny that God's gifts are oftentimes abused and wasted by man, which …
John Henry Newman—Parochial and Plain Sermons, Vol. VIII

So Great Blindness, Moreover, Hath Occupied Men's Minds...
43. So great blindness, moreover, hath occupied men's minds, that to them it is too little if we pronounce some lies not to be sins; but they must needs pronounce it to be sin in some things if we refuse to lie: and to such a pass have they been brought by defending lying, that even that first kind which is of all the most abominably wicked they pronounce to have been used by the Apostle Paul. For in the Epistle to the Galatians, written as it was, like the rest, for doctrine of religion and piety, …
St. Augustine—On Lying