# I, Paul, write this with my own hand

"I, Paul, write this myself." Paul wrote this part with his own hand so that Philemon would know that the words were really from Paul.

# not to mention

"I do not need to remind you" or "You already know." This emphasizes the truth of what Paul is telling him.

# you owe me your own self

"you owe me your own life." or "you owe me much because I saved your life" or "you owe me your own life because what I told you saved your life"