The story is told of a man who sold his house for an incredible bargain with just one stipulation: he would retain ownership of one small nail protruding over the door.
After several years, he wanted the house back, but the new owner was unwilling to sell it. So the first owner went out, found the carcass of a dead dog, and hung it from the single nail he still owned. Soon the house became unlivable and the family was forced to sell the house to the owner of the nail.
If we leave even one small sin in our life Satan will hang his rotting garbage on it.