Only two things are infinite, the universe and human stupidity, and I’m not sure about the former. (Albert Einstein)

All truth passes through three stages. First, it is ridiculed.Second, it is violently opposed. Third, it is accepted as beingself-evident. (Arthur Schopenhauer)

Nothing in the world is more dangerous than sincere ignorance and conscientious stupidity. (Martin Luther King Jr.)

Against stupidity, the gods themselves contend in vain. (Friedrich von Schiller)