"Energy is like money; once spent, it's gone. However, it is possible to make an investment, as opposed to an expenditure, that yields a return."

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Whoop-de-do," said Ram. "What?" "I'm celebrating." "Was that irony or loss of mental function?" asked the expendable. "Was that a rhetorical questions, a bit of humor, or a sign that you are losing confidence in me?" "I have no confidence in you, Ram," said the expendable. "Well, thanks." "You're welcome.

— Orson Scott Card