Catechesis: Third Use of the Law

...it must be diligently noted that when we speak of good works that are in accord with the law of God (for otherwise they are not good works), the word “law” has one single meaning, namely, the unchanging will of God, according to which human beings are to conduct themselves in this life.—FC SD VI:15

...when people are born again through the Spirit of God and set free from the law (that is, liberated from its driving powers and driven by the Spirit of Christ), they live according to the unchanging will of God, as comprehended in the law, and do everything, insofar as they are reborn, from a free and merry and spirit.—FC SD VI:17