Three bulls fed in a field together in the greatest peace and amity. A lion had long watched them in the hope of making prize of them, but found that there was little chance for him so long as they kept all together. He therefore began secretly to spread evil and slanderous reports of one against the other, till he had formed a jealousy and distrust amongst them. No sooner did the lion see that they avoided one another, and fed each by himself apart, than he fell upon them, and so made an easy prey of them all.
The quarrels of friends are the opportunities of foes.
译文：
有三头牛，他们极其友好和睦地一起在野外吃草。一头狮子窥视了很久，想逮住他们，但是发现只要他们聚在一起，就得不到机会。因此，他开始暗地里散布流言蜚语，说这一个跟另一个作对，直到在他们之间制造了妒忌和不信任。狮子一看到他们各奔东西、分头吃草就马上向他们一个一个地进攻。这样，他就轻而易举地把他们全吃光了。
朋友间的不和，就是敌人进攻的机会。
注释：
making prize of 逮住
so long as 只要
no sooner 一旦…立即
fell upon them 向他们攻击