Your most unhappy customers are your greatest source of learning.
Related Quotes
Prefer knowledge to wealth, for the one is transitory, the other perpetual.
The benefits of knowledge can only be realized in practice.
Learning is the only thing the mind never exhausts, never fears, and never regrets.
Nature is the source of all true knowledge. She has her own logic, her own laws, she has no effect without cause nor invention without necessity.
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