When Paul warns servants to do their work “as for the Lord” (Col 3:23) he is getting at this why. Obviously, we’ve got to work so we keep a job in order to eat (or for slaves, so they didn’t get punished), but that’s not enough. We have to focus on the next deeper question to have success. We have to see God as the final object of our efforts if they are going to have real merit. And, I think, we are more likely to have new habits or behaviors stick if we make God’s glory the animating purpose of our actions.