" Many have found it hard to see what claim the law can have on the Christian. We are free from the law, they say; our salvation does not depend on law-keeping; we are justified through the blood and righteousness of Jesus Christ. How, then, can it matter, or make any difference to anything, whether we keep the law henceforth or not?

....While it is certainly true that justification frees one forever from the need to keep the law, or try to, as the means of earning life, it is equally true that adoption lays on one the abiding obligation to keep the law, as the means of pleasing one's newfound Father....The sins of God's children do not destroy their justification or nullify their adoption, but they mar the children's fellowship with their Father. "

― J.I. Packer , Knowing God