Herman Bavinck

The Reformed, however, have thought about this in an entirely different way. The usus politicus and the usus paedagogicus of the law became necessary only accidentally because of sin; even with these uses aside, the most important usus remains, the usus didacticus or normativus. After all, the law is an expression of God’s being. As a human being Christ was subject to the law for Himself. Before the fall Adam had the law written upon his heart. With the believer it is again written upon the tablets of his heart by the Holy Spirit. And all those in heaven will walk according to the law of the Lord.

The Gospel is temporary, but the law is eternal and is restored precisely through the Gospel. Freedom from the law consists, then, not in the fact that the Christian has nothing more to do with the law, but lies in the fact that the law demands nothing more from the Christian as a condition of salvation. The law can no longer judge and condemn him. Instead he delights in the law of God according to the inner man and yearns for it day and night.

Mat 22:37  Jesus said unto him, Thou shalt love the Lord thy God with all thy heart, and with all thy soul, and with all thy mind. 
Mat 22:38  This is the first and great commandment. 
Mat 22:39  And the second is like unto it, Thou shalt love thy neighbour as thyself. 
Mat 22:40  On these two commandments hang all the law and the prophets.

https://rpcnacovenanter.wordpress.com/2012/10/24/herman-bavinck-on-law-and-gospel/