“[L]ove and solidarity are relative. To say that people are more caring toward their relatives is to say that they are more callous toward their nonrelatives. The epigraph to Robert Wright’s book on evolutionary psychology is an excerpt from Graham Greene’s “The Power and the Glory” in which the protagonist broods about his daughter: “He said, ‘Oh god, help her. Damn me, I deserve it, but let her live forever.’ This was the love he should have felt for every soul in the world: all the fear and the wish to save concentrated unjustly on the one child. He began to weep…. He thought: This is what I should feel all the time for everyone.””

— Steven Pinker, The Blank Slate: The Modern Denial of Human Nature (2002), p. 245