Zhuangzi's quote
(simplified Chinese: 庄子; traditional Chinese: 莊子; pinyin: Zhuāng Zǐ; Wade–Giles: Chuang Tzŭ) Chinese philosopher who lived around the 4th century BCE during the Warring States Period, a period corresponding to the philosophical summit of Chinese thought — the Hundred Schools of Thought, and is credited with writing—in part or in whole—a work known by his name, the Zhuangzi. His name Zhuangzi (English "Master Zhuang", with Zi being an honorific) is sometimes spelled Zhuang Tze, Zhuang Zhou, Chuang Tsu, Chuang Tzu, Chouang-Dsi, Chuang Tse, or Chuangtze.
Once upon a time, I dreamt I was a butterfly, fluttering hither and thither, to all intents and purposes a butterfly. I was conscious only of my happiness as a butterfly, unaware that I was myself. Soon I awaked, and there I was, veritably myself again. Now 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.
Butterfly as Companion: Meditations on the First Three Chapters of the Chuang-Tzu