The presence or absence of references to Paul's collection can be a valuable aid in determining the relative chronology of the various Pauline letters. This is particularly true of Galatians if recent commentaries are correct in seeing no evidence in Gal 2.10 that Paul was then actually engaged in raising the collection, and if that agreement did not lead directly to his collection. Also suggestive, but puzzling, are the varied references to the churches taking part in the collection at different points in time, which seem to reflect the often turbulent relations between Paul and his churches.