“Yes. But they must be two ingredients that complement each other; that laugh at each other’s jokes and make allowances for each other’s faults; and that never shout over each other in conversation. Like gin and tonic,” he said, pointing to his drink. “Or bourbon and water . . . Or whiskey and soda . . .” Shaking his head, he raised his glass and drank from it. “Excuse me for expounding.”