It really is very dangerous to believe people. I never have for years.

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 more dangerous than somebody who thinks they’re going to save the world.

The only thing more dangerous than an idea is a belief.

My theory is that we are all idiots. The people who don’t think they’re idiots — they’re the ones that are dangerous.

There is no person who is not dangerous for some one.

It's very dangerous to believe people, I haven't for years.

You think we are in danger there?"
"Danger? It depends what you regard as dangerous. Some wisdom may be dangerous to one man and not to another.

It is dangerous to know, but it is more dangerous not to know.

Beware of false knowledge; it is more dangerous than ignorance.

To believe all men honest is folly. To believe none is something worse.

Nothing in all the world is more dangerous than sincere ignorance and conscientious stupidity.

There's never been a true war that wasn't fought between two sets of people who were certain they were in the right. The really dangerous people believe they are doing whatever they are doing solely and only because it is without question the right thing to do. And that is what makes them dangerous.

To believe all men honest would be folly. To believe none so, is something worse.