Mt15:19- For out of the heart come evil thoughts...
In computer programming, there's a mantra known as GIGO(Garbage in garbage out). The computer wouldn't perform beyond what has been programmed into it. That's exactly how best we can describe every man's heart, no man performs beyond the heart content.
I personally take responsibility for my actions&dont put all blame on the devil because I know I'm only acting out my heart content. There's nothing you do that happens by accident it happened as a result of what your heart has been programmed with.
If every man can take good care of what is being programmed into his heart, you will sure have a good life. We can never be better than our heart content, if you load it with,porn,nude pics etc, you will get sexual immorality as the result.
What are you programming into your heart?
Locate the things around you that can pollute your heart&eliminate them.