Here are some thoughts from Pastor Pat's message on Ephesians 4:20-24:
Martin Luther described sin as a human being curved in on itself.
Our old self is being corrupted. Put it off. Put on a new self.
This requires a new attitude, the same one that was in Christ (see Ephesians 2:5-11).
We need to allow the Holy Spirit to restructure how we think.
It requires a direct encounter with the love of God in Christ and the power of the Holy Spirit.
This is not about trying harder in Jesus. It is about being crucified with Christ. Christ has displaced me in myself.