"I appeal to you for my son Onesimus, who became my son while I was in chains. Formerly he was useless to you, but now he has become useful both to you and to me."These words, written by the apostle Paul to a first-century Christian named Philemon, are tantalizingly brief. Indeed, Paul's epistle to Philemon is one of the shortest books in the entire Bible. While it's direct enough in its way, it certainly leaves plenty to the imagination.A...