CSI 8.3
Rev. Rhodes: Mr. Grissom...do you believe in a separate, living evil?
Grissom: You're a primitive man on the Savannah. You see something move out of the corner of your eye. You assume it's a hyena. You run, you live. If you assume it's the wind and you're wrong, you die. We have the genes of the ones who ran. We're genetically hard-wired to believe living forces that we cannot see.