Generally, the smartest people on the planet – those people who think they are really smart – tend to have the most horrible relationships.

"You think you're so smart" is never a compliment; the only thing worse than being smart is thinking that you are.

Intelligence is dangerous. Intelligence means you will start thinking on your own; you will start looking around on your own. You will not believe in the scriptures; you will believe only in your own experience.

Intelligence is so dangerous; be it human intelligence or machine intelligence. Intelligence is dangerous.

Thoughts are dangerous, he told himself, and thoughts against all science, all sanity, all civilized intelligence, are the most dangerous of all.

Nothing more dangerous than somebody who thinks they’re going to save the world.

The most dangerous person in the world is the one who shows up every single day even when the rewards are uncertain. The one who can tolerate the most uncertainty is the one who will eventually win.

The pretense of knowledge is our most dangerous vice, because it prevents us from getting any better.

The only thing more dangerous than an idea is a belief. And by dangerous I don't mean thought-provoking. I mean: might get people killed.

Nothing is more dangerous than an idea when it is the only one you have.

The most dangerous thing you can do is to take any one impulse of your own nature and set it up as the thing you ought to follow at all costs. There is not one of them which will not make us into devils if we set it up as an absolute guide. You might think love of humanity in general was safe, but it is not. If you leave out justice you will find yourself breaking agreements and faking evidence in trials "for the sake of humanity", and become in the end a cruel and treacherous man.

I'm very proud that some people think that I'm a danger for the intellectual health of students. When people start thinking of health in intellectual activities, I think there is something wrong. In their opinion I am a dangerous man, since I am a crypto-Marxist, an irrationalist, a nihilist.

"Dangerous" does not mean exciting or bold; it means likely to cause great harm. The most dangerous idea is the only dangerous idea: The idea that ideas can be dangerous.

Stupidity is a more dangerous enemy of the good than malice. One may protest against evil; it can be exposed and, if need be, prevented by use of force. Evil always carries within itself the germ of its own subversion in that it leaves behind in human beings at least a sense of unease. Against stupidity we are defenseless. Neither protests nor the use of force accomplish anything here; reasons fall on deaf ears; facts that contradict one’s prejudgment simply need not be believed – in such moments the stupid person even becomes critical – and when facts are irrefutable they are just pushed aside as inconsequential, as incidental. In all this the stupid person, in contrast to the malicious one, is utterly self satisfied and, being easily irritated, becomes dangerous by going on the attack. For that reason, greater caution is called for when dealing with a stupid person than with a malicious one. Never again will we try to persuade the stupid person with reasons, for it is senseless and dangerous.