Begin with praise and honest appreciation. Call attention to people's mistakes indirectly. Talk about your own mistakes before criticizing the other person. Ask questions instead of giving direct orders. Make the fault easy to correct. Make the other person happy about doing what you suggest.
Dale CarnegieIf you argue and rankle and contradict, you may achieve a victory sometimes; but it will be an empty victory because you will never get your opponent's good will.
Dale CarnegieI realize now that people are not thinking about you and me or caring what is said about us. They are thinking about themselves-before breakfast, after breakfast, and right on until ten minutes past midnight. They would be a thousand times more concerned about a slight headache of their own than they would about the news of your death or mine.
Dale Carnegie