Galatians 2

1 Then after 14 years I went up again to Jerusalem with Barnabas, taking Titus along also. 2 I went up because of a revelation and presented to them the gospel I preach among the Gentiles—but privately to those recognized [as leaders]—so that I might not be running, or have run, in vain.

So the venerable Paul, with his impeccable creds and 14 years of tremendous impact in the world, obediently goes to Jerusalem and presents the gospel he was preaching to make sure it matched the One True Gospel. Amazing that after that much time and abuse he was still humble and walking in a "teachable spirit" (not confident in his own experience and ability and track record) to seek confirmation of his message. He was still examining what he did to ensure its veracity. He was not doing the thing with "his eyes shut" or "by heart". I might, by then, lean a bit on my flesh...