In addition to its work in unveiling the sin of the human heart, the law in the New Testament continues to instruct God’s people in their growth in holiness. As considered in the previous chapter, conformity to God’s law continues to produce in God’s people a holiness analogous to God’s. When God’s people live out a life of both external and internal obedience to His law, they “shall be perfect,” just as their Father in heaven is perfect (Matt. 5:48). In this dim reflection of God’s holiness, His people will win praise to His name from others (v. 16). Given this capacity of the law to instruct God’s people in righteousness, it is not surprising that the New Testament authors are comfortable citing the Decalogue and assuming that it still should guide the lives of God’s people (e.g., Eph. 6:1–4).

Stephen G. Myers, God To Us: Covenant Theology in Scripture, 311.