Paul was very confident that Philemon would grant his request because
Answer Details
Paul was confident that Philemon would grant his request because Philemon had proved himself a true Christian partner. Paul had also written to Philemon in a way that appealed to him as a fellow Christian, emphasizing the importance of forgiveness and love. Additionally, Paul promised to pay back all debts owed by Onesimus, which could help to ease any concerns Philemon may have had about taking him back.