The Proposition of the Discourse: It’s NOT man’s gospel!
Gal 1:11 For I would have you know, brothers, that the gospel that was preached by me is not man’s gospel.
Gal 1:12 For I did not receive it from any man, nor was I taught it, but I received it through a revelation of Jesus Christ.
Argument 1: Paul’s past opposition to it
Gal 1:13 For you have heard of my former life in Judaism, how I persecuted the church of God violently and tried to destroy it.
Gal 1:14 And I was advancing in Judaism beyond many of my own age among my people, so extremely zealous was I for the traditions of my fathers.
Prior to conversion Paul was vehemently opposed to this gospel of Grace. So much so, that he tried to destroy all who followed “that way”. However, something happened! He went from trying to destroy this faith to proclaiming its message to the world! A change so radical doesn’t come from man teaching man’s message, but rather it is a change that only comes from a message that has its origin in God.
Argument 2: Paul’s miraculous conversion
Gal 1:15 But when he who had set me apart before I was born, and who called me by his grace,
Gal 1:16 was pleased to reveal his Son to me, in order that I might preach him among the Gentiles, I did not immediately consult with anyone;
It was GOD that set Paul apart before he was born. It was GOD who called Paul by HIS grace. It was GOD who was pleased to reveal HIS Son to him. All of this was of God, not of man.
Argument 3: Paul’s initial lack of exposure to the other Apostles
Gal 1:16b I did not immediately consult with anyone;
Gal 1:17 nor did I go up to Jerusalem to those who were apostles before me, but I went away into Arabia, and returned again to Damascus.
Gal 1:18 Then after three years I went up to Jerusalem to visit Cephas and remained with him fifteen days.
Gal 1:19 But I saw none of the other apostles except James the Lord’s brother.
Gal 1:20 (In what I am writing to you, before God, I do not lie!)
Gal 1:21 Then I went into the regions of Syria and Cilicia.
Paul tells us that after his conversion, he did not immediately consult with anyone, and he also didn’t go up to Jerusalem to see those who were apostles before Paul was a part of the faith. Instead, he went away to Arabia, and returned to Damascus. During this whole time, Paul had zero contact with those who were pillars of the faith, no instruction from anyone other than God himself. Then, only after three years, Paul made a trip up to Jerusalem to visit Cephas (Peter) for only fifteen days. During that time out of all the apostles, he only saw Peter and James. After those 15 days, he returned to Syria and Cilicia. Paul shares all this to make sure that it is understood that he was not instructed by men, but by God.
Argument 4: Paul’s initial anonymity to the church in general
Gal 1:22 And I was still unknown in person to the churches of Judea that are in Christ.
Gal 1:23 They only were hearing it said, “He who used to persecute us is now preaching the faith he once tried to destroy.”
Gal 1:24 And they glorified God because of me.
During the time shortly after Paul’s conversion, the church had not spread too far from the region of Judea. Therefore, the fact that he was still unknown to those of the churches of Judea also proves that he was not taught this gospel by men, but from God.
Argument 5: Paul consults with the other apostles AFTER his revelation
Gal 2:1 Then after fourteen years I went up again to Jerusalem with Barnabas, taking Titus along with me.
Gal 2:2 I went up because of a revelation and set before them (though privately before those who seemed influential) the gospel that I proclaim among the Gentiles, in order to make sure I was not running or had not run in vain.
Paul waited until after he had the revelation from God to consult with the other apostles. In fact, it was this revelation that prompted Paul to make the trip up to Jerusalem. Paul went up to consult with the other apostles in order to ensure that he wasn’t mistaken in the revelation that he had received. He wanted to make sure that it lined up with what the other apostles knew from their time with Christ.
Argument 6: Titus remained uncircumcised
Gal 2:3 But even Titus, who was with me, was not forced to be circumcised, though he was a Greek.
Gal 2:4 Yet because of false brothers secretly brought in–who slipped in to spy out our freedom that we have in Christ Jesus, so that they might bring us into slavery–
Gal 2:5 to them we did not yield in submission even for a moment, so that the truth of the gospel might be preserved for you.
When they did go up to Jerusalem, apparently there were those who wanted Titus to be circumcised, because they believed that it had something to do with his standing with God. However, they did not yield, because doing so would lend itself to the impression that salvation does indeed have something to do with man’s efforts.
Argument 7: Those who were apostles before Paul confirmed that this message was true!
Gal 2:6 And from those who seemed to be influential (what they were makes no difference to me; God shows no partiality)–those, I say, who seemed influential added nothing to me.
Gal 2:7 On the contrary, when they saw that I had been entrusted with the gospel to the uncircumcised, just as Peter had been entrusted with the gospel to the circumcised
Gal 2:8 (for he who worked through Peter for his apostolic ministry to the circumcised worked also through me for mine to the Gentiles),
Gal 2:9 and when James and Cephas and John, who seemed to be pillars, perceived the grace that was given to me, they gave the right hand of fellowship to Barnabas and me, that we should go to the Gentiles and they to the circumcised.
Gal 2:10 Only, they asked us to remember the poor, the very thing I was eager to do.
When Paul did bring God’s revelation of the gospel to him before the other apostles, they confirmed that indeed this is the true gospel of Christ, and also that God is working through Paul to be a minister of the gospel to the gentiles.