In taming our thoughts. For by our thoughts we arouse our passions. And if we are not careful our thoughts that go unchecked become a obsession that gets acted upon. In the Philokalia, the authors felt the need to name some of the more serious passions and give us a way to fight them. It is the foe of God, it is the root of blashemy.
Addiction is also a form of passion.
Perhaps you are addicted to some form of flesh. It may seem simple enough in moderation, but you have allowed it to become a passion, a addiction. The ancients would raise the passions to the level of Gods and bow down and worship them. The passions distort. If ever a man has been in prison for a long period of time, even though he hates it with his soul, he longs to return to it, because of his addiction to the famaliar, to the safe and perhaps to the wicked.