Fear

The stupid never fear. The flashing siren never wails in their adrenaline. They are oblivious to harm. Their skin rarely feels fire. And when it does the pain registers, but the experience evaporates.

Only the smart know fear. The memory sticks, the lesson is learned, the trauma is born. The experienced are cursed with an insane anticipation. They don't rush headlong into fearful scenarios. They run away with wisdom's legs.

Beware of the intelligent insane. For they are cautious, and their experienced rage has become focused. They are able to direct it logically. Its directed energy always hits its target and destroys it with much force.