“Greater caution is called for when dealing with a stupid person than with a malicious one.”

Quoted in Patrick Caughill, "Another Expert Joins Stephen Hawking and Elon Musk in Warning About the Dangers of AI" https://futurism.com/2-expert-thinks-ai-will-undoubtably-wipe-out-humanity/, February 2017

We share the belief that every child is made in the image of God and that every child ought to have the right to an educational opportunity that will enable that child to grow intellectually and spiritually and culturally—not limited by antiquated classrooms, overcrowded classes, or underpaid teachers—but limited only by the capacity which God gave that child to grow.
1950s, Closing address at the final convention of the Congress of Industrial Organizations (1955)
Source: Closing Address at the final convention of the Congress of Industrial Organizations, New York, New York, December 2, 1955, as quoted in Walter P Reuther: Selected Papers (1961), by Henry M. Christman, p. 102

Doin' It Again, Parental Advisory: Explicit Lyrics (1990)
Context: I know that. Some people don't want you to mention certain things. Some people don't want you to say this, some people don't want you to say that. Some people think if you mention some things they might happen. Some people are really fucking stupid. Did you ever notice that, how many stupid people you run into during the day? Goddamn there's a lot of stupid bastards walking around. Carry a pad and pencil with you, you'll wind up with thirty or forty names by the end of the day. Think about this; think about how stupid the average person is, and then realize that half of 'em are stupider than that.

Intelligence gathering
Focus Fourteen

Source: Between the Lines

Source: The Prefect (2007), Chapter 6 (p. 59)

This is attributed to Pirsig by Richard Dawkins in the Preface to The God Delusion (2006), p. 28, but cannot be found prior to that. It is obviously a paraphrase of the following from Pirsig's Lila - An Inquiry Into Morals (1991): „An insane delusion can't be held by a group at all. A person isn't considered insane if there are a number of people who believe the same way. Insanity isn't supposed to be a communicable disease. If one other person starts to believe him, or maybe two or three, then it's a religion." ( books.google http://books.google.de/books?id=51i6WkGn6qYC&q=%22An+insane+delusion%22; books.google http://books.google.de/books?id=WZtRAQAAQBAJ&pg=PA426)
Disputed
Source: Zen and the Art of Motorcycle Maintenance: An Inquiry Into Values

John Keating character