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What we know is like a garden. Outside the circle is an unknown world. The more we know, the bigger the circle is, and we will find that we don't know.
This sentence has been said by many celebrities, and Einstein also said that it originated from Zhi Nuo in ancient Greece ...

A student asked Zhi Nuo, "Teacher, you are so knowledgeable, why are you so modest?" Zhi Nuo replied: "Knowledge is like a circle. The known is inside the circle and the unknown is outside it. The more you know, the bigger the circle, and the bigger the circle, the more you don't know."