When I speak of the covenant of grace, I mean the promises and commands of God to His people in Christ, binding them together forever (Gen. 17:18). We call this bond a covenant because it is sealed with God’s oath (Deut. 7:8–9). We call it the covenant of grace because it comes out of God’s eternal decision to show grace, stands on the accomplishment of God’s grace in Jesus Christ, offers salvation to people as a gift of grace, and implements salvation through God’s regenerating and transforming grace. . . .
The covenant of grace is like a wedding vow that God will never break. The sacrament of baptism is the wedding ring, the outward sign of our union with Him. People broken by sin who have been taught by the Spirit to trust in the gospel are the bride. And Christ is the groom—indeed, the heart of the covenant.
Beeke, Joel. Parenting by God’s Promise. Orlando, FL: Reformation Trust, 2011. xv-xvi.