For two people in a marriage to live together day after day is unquestionably the one miracle the Vatican has overlooked.

Cosby frames the endurance of marriage as a kind of everyday “miracle,” using the Vatican—an institution associated with recognizing miracles—as a comic foil. The humor rests on exaggeration: the real wonder, he suggests, is not rare supernatural events but the sustained, mundane work of cohabitation—negotiating habits, conflicts, boredom, and change “day after day.” The line also implies a secular view of grace: long-term partnership requires patience, forgiveness, and continual adjustment, and its success can feel astonishing precisely because it is achieved through ordinary human effort rather than spectacle.