We are all narcissists to some degree. The goal isn't to eliminate this, but to move from "Deep Narcissism" to "Healthy Narcissism" by developing high-level empathy.
If you want "Las leyes de la naturaleza humana" in English, here are the best sources:
Greene argues that we are not rational creatures; we are social animals driven by irrational emotions. To succeed, you must become an "observer" of human behavior rather than a "victim" of it.