As a matter of self-preservation, a man needs good friends or ardent enemies, for the former instruct him and the latter take him to task.
一个人出于自我保护的需要，需要好朋友或热心的敌人，因为前者教导他，后者责备他。
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Ardent
一个人出于自我保护的需要，需要好朋友或热心的敌人，因为前者教导他，后者责备他。