It's easier to get clean than it is to stay clean.
That's not only true physically; it's also true morally. Not long after you have been cleansed by the blood of Christ, you find yourself repeating the same mistakes that sent Him to the cross, and feeling as distant from Him as you did before you were forgiven.
How many showers of grace do you get before God says, "Enough!" And how do you break the cycle so that you don't have to keep asking for forgiveness for the same old sins?