"When you run into someone who is disagreeable to others, you may be sure he is uncomfortable with himself; the amount of pain we inflict upon others is directly proportional to the amount we feel within us."

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If you disagree with them you may be tempted to interrupt. But don't. It is dangerous. They won't pay attention to you while they still have a lot of ideas of their own crying for expression. So listen patiently and with an open mind.

— Dale Carnegie