"Yu, shall I teach you about knowledge? What you know, you know, what you don't know, you don't know. This is true knowledge".
More quotes by Confucius
The superior man understands what is right; the inferior man understands what will sell.
The superior man loves his soul; the inferior man loves his property.
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Attribution
Quote text and notes from Wikiquote: Confucius (page history), available under CC BY-SA 4.0. Source quality and labels are our own summary of what Wikiquote records.