Says Daniel Dennett, in a discussion with Richard Dawkins. Both atheists, they're talking about the way religion evolves.
I was interested in the quote beyond that context, because I've had to listen to so much political singing and chanting here in Wisconsin over the past year or so. Political chanting troubles me. See, e.g.:
"Occupy Wall Street, Occupy State Street, Occupy Everything and Never Give It Back!"
"Wisconsin 'Singalong' Protesters Confront Workers and Chant About Boycotting Their Employer."
"Do you really want to use rote chanting to train kids to protest against authority?"