Ironically, the law of God, viewed as commands to be obeyed, should actually promote promote living by grace. When we view God’s commands as optional — or think that as God’s children we are no longer under the law as a moral requirement — we subtly slip into a works mentality. If obedience to God’s law is optional, then in our minds we begin to accumulate merit or extra points. “After all, we didn’t have to obey, so we must gain some voluntary obedience.”
But the person who knows that he is required to obey God’s commands, even as a child of God, will see more and more how far short he comes in obedience. And if that person understands the biblical concept of grace, he will be driven more and more into the arms of the Savior and His merit alone.
Jerry Bridges, Transforming Grace (Colorado Springs: NavPress, 1991), 92.