“The problem with the world is that the intelligent people are full of doubts, while the stupid ones are full of confidence.” ~ Charles Bukowski
“Never argue with stupid people, they will drag you down to their level and then beat you with experience.” ~ Mark Twain
“Never underestimate the power of stupid people in large groups.” ~ George Carlin
“This life’s hard, but it’s harder if you’re stupid.” ~ George V. Higgins, [The Friends of Eddie Coyle]
https://www.unschooling.com/search?q=dumb