Your old self is like that pair of old shoes with no tread left in them and will only cause you pain.

“So get rid of your old self, which made you live as you used to—the old self that was being destroyed by its deceitful desires. Your hearts and minds must be made completely new, and you must put on the new self, which is created in God’s likeness and reveals itself in the true life that is upright and holy.” Ephesians 4:22-24

We are to be transformed in our hearts and minds to be made completely new. So how do we do this? We are to think on good things (Phil 4:8), set our minds on things above (Col 3:2) and pray for a clean heart, “Have mercy upon me, O God, according to thy lovingkindness: according unto the multitude of thy tender mercies blot out my transgressions. Wash me thoroughly from mine iniquity, and cleanse me from my sin. Create in me a clean heart, O God; and renew a right spirit within me.” Psalm 51:1-2, 10. KJV