To put off your old self, which belongs to your former manner of life and is corrupt through deceitful desires, and to be renewed in the spirit of your minds, and to put on the new self, created after the likeness of God in true righteousness and holiness. (Ephesians 4:22–24)
We often hold onto our old self when we forget that God has made us new.
Khabbaz, Joseph, "Put On the New" (2022). The Main Thing Devotional. 105.