“It is dangerous to be sincere unless you are also stupid.”

“The good news is that no one can sincerely admit to be stupid in life.”

“Power is okay, and stupidity is usually harmless. Power and stupidity together are dangerous".”

“Is sincerity a virtue by itself? A serial killer has also acted sincerely.”

“It is stupidity rather than courage to refuse to recognize danger when it is close upon you.”

“A little sincerity is a dangerous thing, and a great deal of it is absolutely fatal.”

“Obviously this person's a hazard. Stupid people are dangerous.”

“The greatest danger of bombs is in the explosion of stupidity that they provoke.”

“Stupidity is a more dangerous enemy of the good than malice.”

“Stupidity is far more dangerous than evil, for evil takes a break from time to time, stupidity does not.”