Pauline Epistles means in the bible: The 14 epistles of Paul found in the present New Testament were composed to Church members who had already received some gospel knowledge. These epistles aren’t evangelistic, but rather they have a regulatory nature. This arrangement does not follow chronological or geographical order. It is arranged by length in ascending order, starting with the longest Romans and ending at the shortest Philemon. Except for the epistle of the Hebrews which is placed last due to some questioning whether it was actually written by Paul, this arrangement holds true. Although the chronological and dating order of epistles is not exact, it seems to be consistent with known facts.
(in Bible Dictionary)