In my experience, it hurts a lot more when you find out that someone who you thought was a friend is talking about you behind your back.

Mostly not true... I'd say 99% of the time it's the more you know, the better off you will be.

Depends entirely on the subject. In most cases the saying "knowledge is power" is more accurate.

Not true even slightly.
Ignorance can be lethal - literally one can die due to not knowing countless things.
Or one can just suffer unnecessarily.

Well, I'm an "old folk" and I don't say it.

😀

Perhaps in some cases. For some reason I’m imagining someone eating a cannibals’ favorite dish but not knowing that what they’re eating is human flesh.

True

High blood pressure calls bullshit..

People used to not believe in germs. That hurt millions.