In recent times, the “inconsistency” of Pauline epistles has been a focus of the discussion once again. A brief review of the research history in the 20^th century reveals that “inconsistency” is not a new issue but probably a challenge that Paul had to face during his lifetime. As an ardent admirer of Paul, St. John Chrysostom did his best to refute all claims of “inconsistency” in Pauline epistles. On the one hand, St. John Chrysostom was a staunch defender of the coherence of the Pauline epistles, both in terms of their formal coherence as a codex and in terms of the coherence of their content, based on factors of time, intention, and the Holy Spirit. On the other hand, St. John Chrysostom also defends and praises Paul’s diversity, even giving positive connotations to adjectives that have traditionally carried a negative meaning. St. John Chrysostom’s argument is also strictly circumscribed. In short, Pauline diversity is expressed by Paul’s motivation of saving mankind, the example of Christ’s kenosis, the context of the kerygma, and the selected material and style that form the content of Pauline epistles.