1) What is the surest way to distinguish a misunderstanding from an understanding?

2) What is the surest way to distinguish non-understanding from nonsense?

The answer to both: Someone tells you that you do not understand.

If the fact that you already understand proves to you that you understand, this is proof that you do not understand understanding. If this sounds like nonsense to you, you’ll just have to take my word for it that there is something here to understand.

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If you trust your gut, the world divides into two parts: stuff you already know and bullshit.