This does not exclude our responsibility to work for the purpose of sanctification. Works are not for justification but for sanctification. Works do not save us, but they are essential for transformation! To put it bluntly, we have to practice being God; we have to learn to live as God lives. Is that not how one becomes proficient at something?
God shows in many places in the Bible that He is pleased with our obedience. Our works do not save us, but they please Him (see Hebrews 13:16; Colossians 3:20; I John 3:22; etc.). He is so happy when we work at sanctification because they assist in the transformation process.
Parents ought to understand this. We are pleased by the stumbling efforts of our child to please us. So is God! He looks on our motives, intentions, and the principles involved in what His child is doing. He does not just look at the quantity or the quality—He looks at us as His children, who are trying to imitate Him.
Sanctification is absolutely necessary to prove to God our righteous character and belief in Jesus Christ.
John W. Ritenbaugh
The Covenants, Grace, and Law (Part Nine)