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画虎画皮难画骨,知人知面不知心。
人心难测,表面友善的人,内心未必真诚。  
The first fruit of this imagination - and the first lesson of the social science that embodies it - is the idea that the individual can understand his own experience and gauge his own fate only by locating himself within his period, that he can know his own chances in life only by becoming aware of those of all individuals in his circumstances.