Egotism·Humility, Zhuangzi

同於己為是之，異於己為非之。

- 莊子 寓言

Those which agree with their own they hold to be right, and those which do not so agree they hold to be wrong.

- Zhuangzi (莊子), Metaphorical Language(寓言)

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http://ctext.org/zhuangzi/metaphorical-language