Romans 9:6-9 — How do Christians today rightly understand the division between Isaac and Ishmael? In this sermon on Romans 9:6-9 titled “Child of the Promise,” Dr. Martyn Lloyd-Jones addresses the promise given to Abraham to give him innumerable descendants, to make his name great, and to establish nations and kings through his line. Though Isaac and Ishmael were both sons born to Abraham making them children of his seed, through God’s sovereign plan Isaac was chosen as the one to fulfill God’s covenantal promises. It had nothing to do with Isaac himself; he was chosen even before he was born. This particular and covenantal calling of Isaac to be the child of promise reminds believers today that God’s calling is not dependent on their works and activity or on their intrinsic merit. It is entirely God’s production and according to His sovereign plan and purpose. It is God’s choice and calling that matter.