《淮南子·人间训》
这三次中，前二次讲得不得要领，没有击中要害，所以鲁哀公根本听不进去。有人面对河水垂钓，一整天还钓不到一条小白鱼，这不能怪河中的鱼不上钩，而是在于钩上的鱼饵鱼不喜欢吃。
夫临河而钓，日入而不能得一鲦鱼者，非江河鱼不食也，所以饵之者非其欲也。
Of these three times, the first two times were irrelevant and did not hit the nail on the head, so Duke Ai of Lu did not listen to them at all. Some people face the river and fish for a whole day and still can't catch a small white fish. This can't be blamed on the fish in the river for not taking the bait, but because the bait on the hook is not what the fish like to eat.