Solitude·Self-reliance, Zhuangzi

儵魚出遊從容，是魚樂也。

- 莊子 秋水

These thryssas come out, and play about at their ease - that is the enjoyment of fishes.

- Zhuangzi (莊子), The Floods of Autumn (秋水)

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http://ctext.org/zhuangzi/floods-of-autumn