Your most unhappy customers are your greatest source of learning.

Difficult customers are a source of learning

Bill Gates

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2492 “Don't compare yourself with anyone in this world...if you do so, you are insulting yourself.”
613 Your most unhappy customers are your greatest source of learning
1433 I refuse to answer that question on the grounds that I don't know the answer
1399 It matters not what someone is born, but what they grow to be.
520 It is one of the blessings of old friends that you can afford to be stupid with them.

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