Hey, will power was mentioned above. Here's a verse that came to mind....
Colossians 2:20-23 King James Version (KJV)
20 Wherefore if ye be dead with Christ from the rudiments of the world, why, as though living in the world, are ye subject to ordinances,
21 (Touch not; taste not; handle not;
22 Which all are to perish with the using; ) after the commandments and doctrines of men?
23 Which things have indeed a shew of wisdom in will worship, and humility, and neglecting of the body: not in any honour to the satisfying of the flesh.
I think Paul's point is that a lot of outward standards, be they traditions of men or outward law keeping, look wise and serve to demonstrate will power, look all humble, and appear to deny the flesh.... but they don't actually quench the inherent desires of the flesh.
I don't know, I feel like I don't really know a lot about this stuff sometimes.