One may draw a tiger in so far as its skin， but it is hard to draw its bones. ; One may know a man's face but it is difficult to know his heart.
人生在世，“贼友”固不可交，“密友”必不可少，但最重要的还是多交几个“畏友”。人都知道“画虎画皮难画骨，知人知面不知心”，说的是知人难。
Life is alive, "the thief is friendly" solid cannot be handed in, "Cater-cousin" indispensable, but the most important still is to hand in a few more "esteemed friend".
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