Darwin understood how our biology is fitted to the stories in our social environments, noting, “Many a Hindoo…has been stirred to the bottom of his soul by having partaken of unclean food.” The same thing eaten unknowingly would cause no reaction, so the story of the food, not the food itself, causes the “the soul shaking feeling of remorse.” Stories configure contextual triggers and the expected emotional reactions of our culture—perhaps defining a sort of emotional grammar. - blogs.scientificamerican.com