Plummer on New Covenant Theology
"Covenantal theology, a common Reformed approach to the Scriptures, attempts to view all post-fall relationship between God and his people under the canopy of a covenant of grace. Nevertheless, the old covenant-new covenant distinction present in Scripture would lead us to eschew the term 'covenant of grace' in favor of more explicit biblical categories. Conceptually parallel to the distinction between old and new covenants, the apostle John writes, 'For the law was given through Moses; grace and truth came through Jesus Christ' (John 1:17). One should not understand the old covenant stipulations as intending to save or transform (and thus not subsumed under a covenant of grace) but primarily as intending to prophesy and prepare for the necessity of the new covenant instituted by Messiah Jesus. The theological system that attempts to systematize the Bible through the lens of old and new covenant, especially focusing on the 'newness' brought in Jesus, is called 'new covenant theology'."