text: Verses 13–14 suggest that Paul wants Philemon to send Onesimus back to Paul (possibly freeing him for the purpose). Marshall, Travis and Paul write, "Paul hoped that it might be possible for [Onesimus] to spend some time with him as a missionary colleague... If that is not a request for Onesimus to join Paul’s circle, I do not know what more would need to be said".
  Significance
  In his A History of Christianity, Diarmaid MacCulloch described the epistle as "a Christian foundation document in the justification of slavery".
  In order to better appreciate the Book of Philemon, it is necessary to be aware of the situation of the early Christian community in the Roman Empire; and the economic system of Classical Antiquity based on slavery. According to the Epistle to Diognetus: For the Christians are distinguished from other men neither by country, nor language, nor the customs which they observe... They are in the flesh, but they do not live after the flesh. They pass their days on earth, but they are citizens of heaven. They obey the prescribed laws, and at the same time surpass the laws by their lives.
  Pope Benedict XVI refers to this letter in his encyclical letter, Spe salvi, highlighting the power of Christianity as power of the transformation of society: