If there is existence, there must be non-existence. And if there was a time when nothing existed, there must have been a time before that - when even nothing did not exist. Suddenly, when nothing came into existence, could one really say whether it belonged to the category of existence or non-existence?
ZhuangziPeople live their lives, constantly surrounded by anxiety. if they live long before dying, they end up in senility, worn out by concerns: a terrible fate! The body is treated in a very harsh fashion. Courageous men are seen by everyone under Heaven as worthy, but this doesn't preserve them from death. I am not sure I know whether this is sensible or not.
Zhuangzi