Here's how it is, and this goes back to Socrates

[Clodfobble]

But what's left for the dumb people to do then?

For me, it's the people who falsely or unsuccessfully try to apply this premise that are the worst, though. People who constantly tell everyone how they cop to mistakes all the time, how they are very eager to learn when they're wrong... except they aren't really. Or they spend a lot of time telling everyone else how much they (other people) don't know, and think that's the same thing as admitting that they themselves don't know.