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一只眼睛不如两只眼睛看得明白,一只耳朵不如两只耳朵听得清楚。
最古老、最简短的词语——'是'和'否'——是需要最多思考的。
Wise men talk because they have something to say; fools, becasue they have to say something.
Psychological truth is found in practical experience.