Law and Gospel

"It makes sense to say that we should not confuse God's demands with his promises. Nevertheless, the kind of sharp distinction that Luther proposed [between Law and Gospel] is not biblical. for one thing, biblical proclamations of gospel include commands, particularly commands to repent and believe (Mark 1:15; Acts 2:38). And God gave his law to the children of Israel in a context of gospel: he had delivered them out of Egypt; therefore, they should keep his law (Ex. 20:2-17). The law is a gift of God's grace (Ps 119:29)....

We are not saved by keeping the law, but we are always obligated to keep the law, and once we are saved and raised from death to life, we desire to keep the law out of love for God and for Jesus. The law not only is a terrifying set of commands to drive us to Christ, but also is the gentle voice of the Lord, showing his people that the best blessings of this life come from following his will."

John Frame, Systematic Theology, pp. 96-97.