Main point summary
The gospel Paul preaches didn't come from man, because he received it from Jesus Christ, as demonstrated by his God-accomplished conversion and his subsequent lack of communication with the earlier apostles.
1:11-24 (Feb. 15/19)
For u I would have you know, brothers,
that v the gospel that was preached by me is not man’s gospel. 1
w For I did not receive it from any man,
nor was I taught it,
but I received it x through a revelation of Jesus Christ.
For you have heard of y my former life in Judaism,
how z I persecuted the church of God violently
and tried to destroy it.
And I was advancing in Judaism
beyond many of my own age among my people,
so extremely a zealous was I for b the traditions of my fathers.
But when he c who had set me apart d before I was born, 1
and who e called me by his grace,
was pleased to reveal his Son to 1 me,
in order f that I might preach him among the Gentiles,
I did not immediately consult with anyone; 2
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.
Then g after three years I went up to Jerusalem to visit Cephas
and remained with him fifteen days.
But I saw none of the other apostles except James h the Lord’s brother.
(In what I am writing to you, i before God, I do not lie!)
j Then I went into the regions of Syria and Cilicia.
And I was still unknown in person to k the churches of Judea
that are in Christ.
They only were hearing it said,
“He who used to persecute us is now preaching the faith he once tried to destroy.”
And they glorified God because of me.
Paul is saying, "I am Christ's servant [1:10] because my gospel came from him."