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In a flash of certainty,” he wrote, “I saw that if one’s motives are wrong, nothing can be right. It makes no difference whether you are a mailman, a hairdresser, an insurance salesman, a housewife—whatever. As long as you feel you are serving others, you do the job well. When you are concerned only with helping yourself, you do it less well—a law as inexorable as gravity.
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Stephen R. Covey (The 7 Habits of Highly Effective People)