I realized some time ago that I’m not separate from nature just because I have a primate brain - an upper brain - because underneath the primate brain, there’s a mammalian brain, and beneath the mammalian brain, there’s a reptilian brain; and it’s those two lower brains that made the upper brain possible in the first place. Here’s the way it works:
The primate brain says, “Give peace a chance.”
The mammalian brain says, “Give peace a chance, but first let’s kill this motherfucker.”
And the reptilian brain says, “Let’s just kill the motherfucker, go to the peace rally and get laid.”

George Carlin, Complaints and Grievances (2001)