Well, of course it is not of your own doing. Where did I ever say that?
Ezekiel 36:26-27 helps to answer the OP (Original Post) Questions and the confusion you are having.
"A new heart also will I give you, and a new spirit will I put within you: and I will take away the stony heart out of your flesh, and I will give you an heart of flesh. And I will put my spirit within you, and cause you to walk in my statutes, and ye shall keep my judgments, and do them."
-----> "For this purpose the Son of God was manifested, that he might destroy the works of the devil." ~ 1 John 3:8b