where of

Question

know whereof one speaksIs this correct?He knows whereof he speaks. He doesn't talk about things he knows nothing of.I don't know if this is correct?He knows of what he speaks. He doesn't talk about things he knows nothing of. Thanks

Avangi · Accepted Answer

AnonymousHe knows whereof he speaks.

Yes, this is correct and quite common, but upper register. (He knows what he's talking about! is a slightly lower register equivalent.)

AnonymousHe doesn't talk about things he knows nothing of.

What you say is true, but this expression is typically used in situations where the person thus described has made some specific statement, which others might think is incorrect. The expression is used in his defense.
(When you put it in the negative, perhaps he doesn't say anything at all!)

Granted, it is also used as a general compliment for someone who is considered very knowledgeable on some subject.

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