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When you know a thing, to hold that you know it, and when you do not know a thing, to allow that you do not know it - this is knowledge.

Confucius (2012). “The Analects of Confucius In Plain and Simple English: BookCaps Study Guide”, BookCaps Study Guides
When you know a thing, to hold that you know it, and when you do not know a thing, to allow that you do not know it - this is knowledge.