Abraham didn’t focus on his own impotence and say, “It’s hopeless. This hundred-year-old body could never father a child.” Nor did he survey Sarah’s decades of infertility and give up. He didn’t tiptoe around God’s promise asking cautiously skeptical questions. He plunged into the promise and came up strong, ready for God, sure that God would make good on what he had said. That’s why it is said, “Abraham was declared fit before God by trusting God to set him right.” But it’s not just Abraham; it’s also us! The same thing gets said about us when we embrace and believe the One who brought Jesus to life when the conditions were equally hopeless. The sacrificed Jesus made us fit for God, set us right with God.

Don’t suppose for a moment, though, that God’s Word has malfunctioned in some way or other. The problem goes back a long way. From the outset, not all Israelites of the flesh were Israelites of the spirit. It wasn’t Abraham’s sperm that gave identity here, but God’s promise. Remember how it was put: “Your family will be defined by Isaac”? That means that Israelite identity was never racially determined by sexual transmission, but it was God-determined by promise. Remember that promise, “When I come back next year at this time, Sarah will have a son”?