Jesus says, “New wine is for fresh wineskins.” If you put new wine into an old wineskin, the newly fermented wine will burst the old skin so that you not only lose the wine but the skin. In order to keep the new wine, it must be stored in a new wineskin.
And so, without the indwelling power of the Holy Spirit, we can not be made new creations. Jesus tells Nicodemus, “You must be born again” in order to “see the kingdom of God.” (John 3:3) Our new lives can not function in our old systems — the system itself must be altered so that our lives are made real; so that we function as parts of the body of Christ.
The extraordinary power of God can not enter the ‘old nature.’ Rather, that nature is changed at a fundamental level so that God is able to make a place for Himself in our hearts.
Therefore, God commands, “Be holy as I Am holy.” And Jesus says, “Be perfect as your heavenly Father is perfect.”