Evil grows and affects not only the place it's in, but also its surroundings. It damages everything if it was out of control of the good. Evil never stays at one place but it keeps spreading and growing. Even when good is there sitting beside evil; evil will not stop until the battle starts between them, where good always wins when it keeps fighting to the end. Good has always been stronger than evil and whenever good arrives evil escapes. That's why good must have faith, insistence, and be determined in defeating evil, regardless of how much time and effort it needs to defeat it. If good does not deal with evil when it first confronts it, evil then will grow and possibly gain in strength, thus becoming harder to be defeated.