Philemon 1:17-19

Paul is asking that Philemon trust him.  To take back Onesimus as if he was Paul himself.  That is asking a lot and by comparing the two men as similar, forces Philemon to possibly see Onesimus in a new light.  Paul goes so far as to take onto himself anything that Onesimus maybe have done wrong.  Just as Christ took our sins, so Paul said to put onto his account anything that Onesimus might have wronged him in.  This is where Paul gets a bit caustic.  He says that he is writing this himself, that even though Philemon owes Paul his own life, that Paul will take on any expenses Philemon feels Onesimus owes and pay it back.  This is the ultimate guilt trip.