6I am completely confident that God, who has begun to do in you what is good, (OR, that since God has begun to do in you what is good, he) will continue to do that until he finishes doing it on the day Christ Jesus MTY returns.
6I know that God started to do something good inside you, and he will keep on doing it until he has finished it properly. That will be when Jesus Christ comes back again. I’m really sure that God will do this good thing inside you.