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One of the 7 principles from "How to Stop Worrying and Start Living" that help with customer service attitude control
What is "Live in day-tight compartments", "Don't fuss about trifles", "Cooperate with the inevitable", "Decide how much anxiety something is worth and refuse to give it more", "Create happiness for others", "Expect ingratitude", "Put enthusiasm into your work" or "Do the very best you can"