" So we begin the story with one creation, one covenant, one people, one mandate, one city. Then after the fall, there is a covenant of creation (with its cultural mandate still in effect for all people, with the law of that covenant universally inscribed on the conscience) and a covenant of grace (with its gospel publicly announced to transgressors), a City of Man (secular but even in its rejection of God, upheld by God’s gracious hand for the time being) and a City of God (holy but even in its acceptance by God, sharing in the common curse of a fallen world). Just as the failure to distinguish law covenant from promise covenant leads to manifold confusions in our understanding of salvation, tremendous problems arise when we fail to distinguish adequately between God’s general care for the secular order and his special concern for the redemption of his people. "

― Michael S. Horton , God of Promise: Introducing Covenant Theology