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If you look into your own heart, and you find nothing wrong there, what is there to worry about? What is there to fear?

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Study the past, if you would divine the future.

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I hear, I know. I see, I remember. I do, I understand.

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If we don't know life, how can we know death?

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To know what you know and what you do not know, that is true knowledge.

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Real knowledge is to know the extent of one's ignorance.