You were taught, with regard to your former way of life, to put off your old self, which is being corrupted by its deceitful desires; to be made new in the attitude of your minds; and to put on the new self, created to be like God in true righteousness and holiness.
Christians are renewed in the image of God and our being transformed more and more into the likeness of Christ Jesus.
Every Christian is predestined and called to become Christ-like.
Why put off our old selves? Because we were once corrupted by sinful nature. Jesus is the truth and Satan is the father of lies. As Christians we must take no part of our former lives.
We are made new in our minds. Our thoughts provoke our actions. We think differently therefore we want to live better lives.
We are made righteous and holy through Jesus.
We were created in the image of God. It is His desire for us to live as he does. We love Him and therefore we want to please him in our new way of living.