This letter, from Paul who was imprisoned in Rome, to the church in what is now Western Turkey, had to be delivered. There was no reliable postal service, no electronic communication, only couriers. Although some would have made it their trade to take letters for people they did not know, Paul's message was so precious he sent it with a trusted personal courier, Tychicus. Whenever possible, the apostolic team did not travel alone - Jesus sent disciples out in pairs (Luke 10:1); so Onesimus went as well. The two men had very different backgrounds, but both were described as 'faithful'.