“Nothing in the world is more dangerous than sincere ignorance and conscientious stupidity.”
“Nothing is more difficult than to understand the dead, I've found; but nothing is more dangerous than to ignore them.”
“It is dangerous to be sincere unless you are also stupid.”
“And there is nothing more dangerous in this world, in any world, than someone calm, clear and angry.”
“Imperfect understanding is often more dangerous than ignorance.”
“Beware of false knowledge; it is more dangerous than ignorance.”