Life, Zhuangzi

人生天地之間，若白駒之過郤。

- 莊子 知北遊

Life between heaven and earth is like a white colt's passing a crevice.

- Zhuangzi (莊子), Knowledge Rambling in the North (知北遊)

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http://ctext.org/zhuangzi/knowledge-rambling-in-the-north