have a good knowledge of oneself but a poor knowledge of others; understand oneself but not others ❍ 有一种人，～，又有一种人，明于知彼，暗于知己，他们都是不能解决战争规律的学习和使用的问题的。(《毛泽东选集》166)Some people are good at knowing themselves and poor at knowing their enemy,and some are the other way round; neither can solve the problem of learning and applying the laws of war.