4 But when the kindness and the love of God our Savior toward man appeared,
5 not by works of righteousness which we have done, but according to His mercy He saved us, through the washing of regeneration and renewing of the Holy Spirit,
The fourth work of redemption that Christ has completed within the heart of every believer is the work of regeneration. Regeneration is the new birth, the rebirth of the human spirit. When someone puts their faith in Christ and calls upon Him for salvation with repentance, there is a rebirthing of a new spirit man within them. The washing away of the old man and the renewing of the Holy Spirit coming to live within us takes place.
In this area of a believers life the devil tries to convince us that we are who we are, we cannot change. He tries to get us to fall for this lie so that we continue to live by the old natures habits and ways so that he can keep us in bondage to that old nature. But once the spirit on the inside becomes new, we can now as scripture teaches us, walk in newness of life. Anything about our outward behavior and way of living can change.
2 Corinthians 5:17 Whoever is a believer in Christ is a new creation. The old way of living has disappeared. A new way of living has come into existence.
You can change anything about you life for you are not who you used to be. A new way of living has come for the believer. We should not continue in our old ways, but begin to walk in the footsteps of our Savior. Romans 12:1-2 tells us how. We are to present our bodies unto Him as a living sacrifice, and we are transformed by renewing our minds to the new man on the inside. We are no longer who we used to be!