Jesus disarmed principalities and powers
And by putting off his body, he stripped the Principalities and the Powers and shamed them openly in his Essential Self. http://bible.cc/colossians/2-15.htm
The strength of sin is the law.
For sin is the sting that results in death, and the law gives sin its power.
Christ is the end of the law
Christ is the end of the law so that there may be righteousness for everyone who believes.