Cleansing, then Power

First comes cleansing, then comes power, as Joshua related: "Sanctify yourselves, for tomorrow the Lord will do wonders among you" (Joshua 3:5) We cleanse ourselves by repentance, which is to humble ourselves and acknowledge our sin, then we go to the cross for the forgiveness and power to turn away the sin. The Scriptures teach repeatedly that we cannot only do this for ourselves, but for the entities that we identify with. This is one of the great lessons of the lives of Joseph, Moses, David, Ezra, Nehemiah, Daniel, Jeremiah, and most of all - our Lord Jesus Himself. Is this not what Jesus did for us on the cross? To bear our sins He had to become one of us.

Source: John Dawson - What Every Christian Should Know About Reconciliation, p. 22