St. John Chrysostom 
The Homilies On Various Epistles [EPUB ebook] 

These Homilies are often less complete in exposition than those on earlier books of the New Testament, and in literary excellence will not compare with the Homilies on the Statues, and many other discourses given at Antioch. But to the student of preaching, they are quite as instructive, if not really more so.
Contents:
Commentary On the Epistle of St. Paul to the Galatians.
Homilies on the Epistle of St. Paul to the Ephesians
Homilies on the Epistle of St. Paul to the Philippians
Homilies on the Epistle of St. Paul to the Colossians.
Homilies on the First Epistle of St. Paul to the Thessalonians.
Homilies on the Second Epistle of St. Paul to the Thessalonians.
Homilies on the First Epistle of St. Paul to Timothy
Homilies on the Second Epistle of St. Paul to Timothy.
Homilies on the Epistle of St. Paul to Titus.
Homilies on the Epistle of St. Paul to Philemon