Tao is the source of both fullness and emptiness. But it is itself neither fullness nor emptiness.
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.
ZhuangziBy ethical argument and moral principle the greatest crimes are eventually shown to have been necessary, and, in fact, a signal benefit to mankind.
Zhuangzi