The LORD said, “I will surely return to you about this time next year, and Sarah your wife shall have a son.” And Sarah was listening at the tent door behind him . . . So Sarah laughed to herself, saying, “After I am worn out, and my lord is old, shall I have pleasure?” (Genesis 18:10, 12 ESV) Sarah laughed. There was no sound—only an inner response to the improbable words she heard. She stood just inside her tent, hidden from the view of the visitor talking with her husband Abraham. Have a baby? At ninety years of age? Yes,…