a hound having started a hare on the hillside pursued her for some distance, at one time biting her with his teeth as if he would take her life, and at another fawning upon her, as if in play with another dog. the hare said to him, "i wish you would act sincerely by me, and show yourself in your true colors. if you are a friend, why do you bite me so hard? if an enemy, why do you fawn on me? "

no one can be a friend if you know not whether to trust or distrust him.

一只猎狗在山脚下抓到一只兔子，一会儿用牙齿咬她，好像要取兔子的性命，一会儿又极力地讨好她，像是在和另一个同伴玩耍。【无忧书苑】痛苦不堪的兔子对猎狗说:“是敌是友？我恳求你露出真面目吧！如果我们是朋友，你为什么要那么用力地咬我？如果我们是敌人，你为什么要那样讨好我？”

如果你不清楚应不应该信任一个人，那么他就不会成为你的朋友。