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The most dangerous people are the ignorant.

The most dangerous thing in the world is the sin of self-reliance and the stupor of worldliness.

Nothing is as dangerous as an ignorant friend; a wise enemy is to be preferred.

There's nothing more dangerous than a resourceful idiot.

Entire ignorance is not so terrible or extreme an evil, and is far from being the greatest of all; too much cleverness and too much learning, accompanied with ill bringing-up, are far more fatal.

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

The world is a dangerous place to live; not because of the people who are evil, but because of the people who don't do anything about it.

People are dangerous when they have nothing to lose.

There is perhaps nothing so bad and so dangerous in life as fear.