Have you ever seen a dirty ring around a bathtub? It is very disgusting! I have also noticed that if you go to the DMV and look at the wall behind the rows of chairs you see a darkened, greasy looking spot where countless people have rested the back of their heads. Yuck. I tend to be a little germ conscience and thinking about stuff like this is enough to make me want to live inside a plastic bubble.
How is your life Christian? Is there a ring of sin around you? Have you left behind, in the view of the lost world, a greasy spot where you once rested? It is important that you and I keep a clean slate before God. When the Holy Spirit convicts us it is for the purpose of us getting clean. Let me encourage you to clean up after yourself so there is no stain of sin where you are.