A heart gone bad

I feel as if my heart has gone bad. It constantly devises wicked plans and it is always trying to persuade me to obey its desires. And for the longest time (pretty much my entire life) I have tried to follow my heart; not realizing that as I do follow my heart; it leads me to pretty bad places; dark places. And according to the Master, where my treasure is there my heart will be also. And with that said, I need to force my heart to follow me, not the other way around. I need to beat my heart into submission to follow me as I in turn follow Jesus. This will be a difficult task and only by God's grace will I be able to pursue the One who pursued me with all of his heart.