And lest I should be exalted above measure by the abundance of the revelations, a thorn in the flesh was given to me, a messenger of Satan to buffet me, lest I be exalted above measure. 8 Concerning this thing I pleaded with the Lord three times that it might depart from me. 9 And He said to me, "My grace is sufficient for you, for My strength is made perfect in weakness."
Actually, again, we don't know this.
I like your turn of phrase, here, VR. We DON'T know what we AREN'T told. We DO know what we ARE told.
Was it because of great revelation? Yes. Was it because he would have exalted himself? I don't believe so.
So either Paul said HE would exalt himself too much, OR he said that otherwise WE would exalt him too much. One way or the other. I like the passage you posted about the gate beautiful; it certainly lays the stage. However, there is another clue directly in Paul's words.
"My strength is made perfect in weakness."
Care to speculate as to just what that means?
One Lord, One Faith, One Baptism, One God and Father over us all.