" For here was the hole in Alma’s theory: she could not, for the life of her, understand the evolutionary advantages of altruism and self-sacrifice. If the natural world was indeed the sphere of amoral and constant struggle for survival that it appeared to be, and if outcompeting one’s rivals was the key to dominance, adaptation, and endurance—then what was one supposed to make, for instance, of someone like her sister Prudence? Whenever Alma mentioned her sister’s name, with respect to her theory of competitive alteration, her uncle groaned. "

― Elizabeth Gilbert , The Signature of All Things