Then after three years I went up to Jerusalem to see Peter, and abode with him fifteen days.
All Commentaries on Galatians 1:18 Go To Galatians 1
Augustine of Hippo
AD 430
If, when Paul had evangelized Arabia, he subsequently saw Peter, it was not so that he might learn the gospel from Peter himself (for then he would have seen him before) but so that he might enhance familial love by being with the apostles.