Every day we battle against something within us that makes us act in ways that we often do not want to. And after the action, the word, or the attitude, we find ourselves wondering why did we do it. Some call it human nature, the shadow, the dark side, instinctive urges, or sin. In order to understand this, we need to compare it to something that we are related to, so we know how to fight against it. In this book the comparison of sin with leprosy is made. How it is contracted. How it affects us. How it is treated. How to be cleaned. I am not an expert in the doctrine of sin, but I am in its practice. Every fall, every mistake, every slip has left me experiences, scars, and lessons that have helped me understand what I battle every day, improve myself, and be ready for the next time I find myself in a simi lar situation.