Right is not right; so is not so. If right were really right it would differ so clearly from not right that there would be no need for argument. If s… - Zhuangzi

Once upon a time, I, Chuang Tzu, dreamt that i was a butterfly. flitting around and enjoying myself. I had no idea I was Chuang Tzu. Then suddenly I woke up and was Chuang Tzu again. But I could not tell, had I been Chuang Tzu dreaming I was a butterfly, or a butterfly dreaming I was now Chuang Tzu? However, there must be some sort of difference between Chuang Tzu and a butterfly! We call this the transformation of things.

A child, obeying his father and mother, goes wherever he is told, east or west, south or north. And the yin and yang - how much more are they to a man than father or mother! Now that they have brought me to the verge of death, if I should refuse to obey them, how perverse I would be! What fault is it of theirs? The Great Clod burdens me with form, labors me with life, eases me in old age, and rests me in death. So if I think well of my life, for the same reason I must think well of my death. When a skilled smith is casting metal, if the metal should leap up and say, 'I insist upon being made into a Moye!' he would surely regard it as very inauspicious metal indeed. Now, having had the audacity to take on human form once, if I should say, 'I don't want to be anything but a man! Nothing but a man!', the Creator would surely regard me as a most inauspicious sort of person. So now I think of heaven and earth as a great furnace, and the Creator as a skilled smith. Where could he send me that would not be all right? I will go off to sleep peacefully, and then with a start I will wake up.

It can be passed on, but not received.
It can be obtained, but not seen.
可傳而不可受，可得而不可見.