And, in regard to stupidity: Albert Einstein said, “there are two things that are infinite; the universe and human stupidity and I’m not sure about the universe.”
During my usual internet safari, I came across a page of W.C. Fields quotes, and immediately thought of this thread, as his one-liners embody more commonsense than most....well, except maybe Mark Twain: https://iheartintelligence.com/2016/02/19/timeless-w-c-fields/ Just in case anyone here wants to click on this link, be forewarned that Fields is not known for mincing words.
Love it! May I also add a small piece of information I liked to pass around to my former students: A thief willingly gives away his good character which is far more valuable than anything he has ever stolen for one’s character is the predecessor of one’s destiny.
"If you are depressed, you live in the Past. If you are anxious, you live in the Future. If you are happy, you live in the Present." - Ancient Chinese Philosopher and Poet, Lao Tzu
"If you can't explain it to a six-year-old, you don't understand it yourself." - Attributed to Richard Feynman