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?
ZhuangziOnce Chuang Chou dreamt he was a butterfly, a butterfly flitting and fluttering around, happy with himself and doing as he pleased. He didn't know he was Chuang Chou. Suddenly he woke up and there he was, solid and unmistakeable Chuang Chou. But he didn't know if he was Chuang Chou who had dreamt he was a butterfly, or a butterfly dreaming he was Chuang Chou.
ZhuangziThe hidden so-called scholars of old did not hide themselves and refuse to be seen. They did not close the door on their words and refuse to let them out. They did not shut away their wisdom and refuse to share it. But those times were all haywire. If it had been possible for them to act, they could have done great things, bringing all to Oneness without any sign of doing so. However, the times were not favorable and it was not possible, so they put down deep roots, remained still and waited. this was the Tao by which they survived.
Zhuangzi