So 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.
Zhuangzi