Whom He foreknew, He also predestined to be conformed to the image of His Son, that He might be the firstborn among many brethren. (Romans 8:29)
Do not be conformed to this world, but be transformed by the renewing of your mind, that you may prove what is that good and acceptable and perfect will of God. (Romans 12:1)
The mystery … is Christ in you, the hope of glory. (Colossians 1:26-27)
For it is God who works in you to will and to act in order to fulfill his good purpose. (Philippians 2:13 NIV)
The grace of God leads us neither to legalism nor lawlessness. What this grace does do is change us, not from the outside but from the inside. God, in His grace, not only justifies us, He also sanctifies us, and is constantly at work in us, conforming us to the image of His Son. It is not about rules and regulations, which could never produce the life of Christ in us, but about relationship — God dwelling in us by His own Spirit.
A grace that does not change us, from the inside out, is not a grace that comes from God. This change is not a transformation we effect in ourselves in response to God’s grace but a transformation God effects in us by His grace. Our only response is faith — entrusting ourselves into His hands.