Some people, when they do someone a favor, are always looking for a chance to call it in. And some aren't, but they're still aware of it--still regar… - Marcus Aurelius

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Some people, when they do someone a favor, are always looking for a chance to call it in. And some aren't, but they're still aware of it--still regard it as a debt. But others don't even do that. They're like a vine that produces grapes without looking for anything in return. (Hays translation)