Hashem takes away understanding from wise people.

"He removes the speech of the trusted ones. He takes away the understanding of the old." (Iyov 12:20)
There are some people who are very trustworthy and speak very clearly. There are some people who speak with deep understanding. (Ralbag) When a person relies on his own wisdom and his own speech, and does not need Hashem, then Hashem will take away His wisdom and His speech. All speech is a gift from Hashem.
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