A battering ram can knock down a city wall, but it cannot stop a hole. Different things have different uses.
ZhuangziIf a man is crossing the river and an empty boat collides with his skiff, even though he is a bad tempered man he will not become very angry. But if he sees a man in the other boat he will scream and shout and curse at the man to steer clear. If you can empty your own boat crossing the river of the world, no one will oppose you, no one will seek to harm you. Thus is the perfect man - his boat is empty.
ZhuangziSo if loss of what gives happiness causes you distress when it fades, you can now understand that such happiness is worthless. It is said, those who lose themselves in their desire for things also lose their innate nature by being vulgar.
ZhuangziCompare birth with death, compare death with life; compare what is possible with what is not possible and compare what is not possible with what is possible; because there is, there is not, and because there is not, there is.
ZhuangziThe bait is the means to get the fish where you want it, catch the fish and you forget the bait. The snare is the means to get the rabbit where you want it, catch the rabbit and forget the snare. Words are the means to get the idea where you want it, catch on to the idea and you forget about the words. Where shall I find a man who forgets about words, and have a word with him?
Zhuangzi