“Given the unchangeable character of God, there can be no question about the principle of unity and continuity in his revelation (the Bible). Unity and continuity should be presumed over discontinuity. Who but God alone has the prerogative to change what God has said? When it comes to Scripture, only God is permitted to say what is in fact new about the new covenant. This basic unity of God and his revelation is seen in the fact that God has, from the beginning, dealt with humanity in terms of redemptive covenants. God has had one plan from the start to redeem sinners. He has pursued and brought that plan to pass in a smooth and unbroken fashion. God has continuously unfolded, through more and more revelation, his redemptive plan for man and the world. Only God may determine who is and who is not to be included in, or excluded from, his covenant people. In the old covenant, the children of believers were included among his covenant people and received his covenant sign. In the new covenant – an expansion of the old covenant – God nowhere reveals a new restriction on covenant membership or covenant blessings. God still loves believers, their children, and their children’s children for a thousand generations of those who love him and keep his commandments.”
-Randy Booth in “Covenant Transition,” from The Case for Covenantal Infant Baptism (Gregg Strawbridge, ed.), pp 183-184.