I do not know whether I was then a man dreaming I was a butterfly, or whether I am now a butterfly dreaming I am a man.

I do not know whether I was then a man dreaming I was a butterfly, or whether I am now a butterfly dreaming I am a man.

不知周之梦为胡蝶与？胡蝶之梦为周与？

-- Zhuangzi 庄子