You, shall I teach you what knowledge is? 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.
由！诲女知之乎？知之为知之，不知为不知，是知也。
Source: The Analects, Wei Zheng II, Chapter 17
Author: Confucius / 孔子
