Freedom to breed will bring ruin to all.

— Garrett Hardin

If this man had not twelve thousand a year, he would be a very stupid fellow.

— Jane Austen

Dzieje kultury wykazują, ze głupota jest siostrą bliźniaczą rozumu, ona rośnie najbujniej nie na glebie dziewiczej ignorancji , lecz na gruncie uprawnym siódmym potem doktorów I profesorów. Wielkie absurdy nie są wymyślane przez tych, których rozum krząta się wokół spraw codziennych. Nic dziwnego zatem, że właśnie najintensywniejsi myśliciele bywali producentami największego głupstwa. / The history of culture shows that foolishness is a twin sister of wisdom. It does not flourish on the fields of pure ignorance but on the fields tirelessly plowed by doctors and professors. Great absurdities do not flourish where one is busy with everyday life. No wonder that sometimes most vigorous thinkers come up with utmost stupidities. (Dziennik 1956, XIX, Thursday).

— Witold Gombrowicz

I consider myself a synthetic thinker in a virtual domain therefore if I’m way off there is no solid foundation or reference for authentic stupidity.

— Carl Henegan

No sooner does man discover intelligence than he tries to involve it in his own stupidity.

— Jacques Yves Cousteau

Me?...Stupid?” I fluttered my eyes innocently. “When have I ever done anything stupid?”“Don’t get me wrong, you’re the smartest person I know…” She fought back a smile. “But you have done some of the dumbest things I ever thought possible.”“So you have a point…” I shrugged. “Still not stopping me.

— M.A. George

THE GAP: Closed-Mindedness can create it, Narrow-Mindedness can widen it, Open-Mindedness can close it, Like-Mindedness… Will Bridge It!

— Auliq Ice

Be a hero or enjoy fucking life, don’t try to be bunch of stupid flesh acting as normal humans.

— M.F. Moonzajer

Never underestimate the power of human stupidity.

— Robert A. Heinlein

And after all, if stupidity did not, when seen from within, look so exactly like talent as to be mistaken for it, and if it could not, when seen from the outside, appear as progress, genius, hope, and improvement, doubtless no one would want to be stupid, and there would be no stupidity.

— Robert Musil