>Often quoted, rarely supported by actual evidence.
A fair point.
That said, why don't we do a little field research and record everything you say for a few months and see if we can generate some evidence one way or another?
What's that? You don't consent to such recording? Why not?
Yes. There is a little snark there, but that's kind of the point.
It's not about what you say, but whether or not it's ethical to record someone without their knowledge or consent.
A more recent treatment (albeit a fictional one) of that idea can be found here[1]
[0] https://www.brainyquote.com/quotes/cardinal_richelieu_183310
[1] https://babylon5.fandom.com/wiki/The_Illusion_of_Truth