Regardless of all the rest, what a saying meant 1000 years ago is irrelevant. I find it bizarre anyone is providing historical usage as if proves something.
You could pick endless words and sayings in English from 1000 years ago, which are entirely different now.
So what?
The modern usage is quite clear.
> The modern usage is quite clear.
Perhaps it is "clear", but it may have lost the lesson of the original adage. Perhaps that lesson is worth knowing.