There's nothing more dangerous than a resourceful idiot.

There is nothing more dangerous than the conscience of a bigot.

Nothing is more dangerous to men than a sudden change of fortune.

Nothing defines humans better than their willingness to do irrational things in the pursuit of phenomenally unlikely payoffs. This is the principle behind lotteries, dating, and religion.

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

Nothing is more dangerous than a dogmatic worldview - nothing more constraining, more blinding to innovation, more destructive of openness to novelty.