The Apostle to the Gentiles & The Mystery Revealed
William R. Newell writes in his booklet "Peter vs Paul" that:
"God does as He pleases, and it pleased Him to choose,— first, to save people in this dispensation through \"the foolishness of preaching,\" or the \"preached thing\"; that is, through the exact message about Christ crucified, and what was done at the cross (See 1 Cor. 1:21). And second, it pleased Him to choose Paul to be the great proclaimer and revealer of just what the Gospel is for this dispensation."
"You can judge any man's preaching or teaching by this rule—is he Pauline? Does his doctrine start and finish according to those statements of Christian doctrine uttered by the Apostle Paul?"
"No matter how wonderful a man may seem in his gifts and apparent consecration, if his Gospel is not Pauline, it is not the Gospel; and we might as well get our minds settled at once as to that."
Paul's miraculous encounter with the resurrected, glorified Christ on the Damascus road, as recounted in the book of Acts.
"Howbeit for this cause I obtained mercy, that in me first Jesus Christ might shew forth all longsuffering, for a pattern to them which should hereafter believe on him to life everlasting."
"But the Lord said unto him, Go thy way: for he is a chosen vessel unto me, to bear my name before the Gentiles, and kings, and the children of Israel: 16 For I will show him how great things he must suffer for my name's sake."
"And he said, The God of our fathers hath chosen thee, that thou shouldest know his will, and see that Just One, and shouldest hear the voice of his mouth. 15 For thou shalt be his witness unto all men of what thou hast seen and heard."
"But rise, and stand upon thy feet: for I have appeared unto thee for this purpose, to make thee a minister and a witness both of these things which thou hast seen, and of those things in the which I will appear unto thee; 17 Delivering thee from the people, and from the Gentiles, unto whom now I send thee, 18 To open their eyes, and to turn them from darkness to light, and from the power of Satan unto God, that they may receive forgiveness of sins, and inheritance among them which are sanctified by faith that is in me."