“I update negatively on people who mislead (including expressing great confidence while being wrong, and especially including avoidable mischaracterizations of others' views); people who do tangible damage (usually by misleading); and people who create little of value despite large amounts of opportunity and time investment.”

Source: Dreaming of You

Audio lectures, Dangers Inherent in Public Education (March 24, 1986)

In [Kaur, Raminder, Sinha, Ajay J, Bollyworld: Popular Indian Cinema Through A Transnational Lens, http://books.google.com/books?id=DGtNhQsLl7wC&pg=PA13, 13 July 2005, SAGE Publications, 978-0-7619-3321-2, 13]
Quote

Source: Tuesdays with Morrie

Quoted in Picasso on Art (1988), ed. Dore Ashton.
Attributed from posthumous publications

"Hecklers are Garbage" (20 September 2008) http://www.youtube.com/watch?v=2nYlRFGL8UQ
Context: First I'd like to address the hecklers (cause I know you're out there!)... There are people who contribute, people who create, and people who destroy.... Nobody likes hecklers — nobody likes heckling — it's not interesting, it's not funny, it's certainly not appreciated, and it's of no use and no good. And it just hurts people. And I'm not sure if the intention is to hurt people, in which case you are evil — and if not, that's what you are doing, so it is not constructive, at all. The whole idea of 'I must be honest, so here is what I think' is complete baloney. If there is information you must transmit to another, you must do it empathically, or it is worthless....
Essentially, what I have for you heckler victims is this: If you do what you must, and you do what is right, you are bulletproof! Don't bother changing — don't listen to any of that garbage — because it's garbage!

"The antiscientifical revolution and mathematics" (1998, Vatican).