Wisdom, Zhuangzi

則知者不言，言者不知，而世豈識之哉。

- 莊子, 天道

The wise do not speak and those who do speak are not wise. How should the world know that real nature?

- Zhuangzi (莊子), The Way of Heaven (天道)

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http://ctext.org/zhuangzi/tian-dao