Romans 7:14-15

We know that the law is spiritual; but I am unspiritual, sold as a slave to sin. 
I do not understand what I do. For what I want to do, I do not do. But what I hate, I do.

Romans 7 14 15 21 23

So this is the principle I have discovered: When I want to do good, evil is right there with me. For in my inner being I delight in Gods law. But I see another law at work in my body, warring against the law of my mind and holding me captive to the law of sin that dwells within me.

Romans 7:21-23 

Walk by the Spirit, and you will not gratify the desires of the flesh. Above all else, guard your heart, for everything you do flows from it.

Galatians 5:16, Proverbs 4:23.

It can be done.