Love should be treated like a business deal, but every business deal has its own terms and its own currency. And in love, the currency is virtue. You love people not for what you do for them or what they do for you. You love them for the values, the virtues, which they have achieved in their own character.
But you were always a good man of business, Jacob,' faltered Scrooge, who now began to apply this to himself. Business!' cried the Ghost, wringing its hands again. Mankind was my business; charity, mercy, forbearance, and benevolence, were, all, my business. The deals of my trade were but a drop of water in the comprehensive ocean of my business!