Morality, then, is not a set of arbitrary regulations dictated by a vengeful deity and written down in a book; nor is it the custom of a particular culture or tribe. It is a consequence of the interchangeability of perspectives and the opportunity the world provides for positive-sum games.
Steven PinkerEvolutionary psychology is one of four sciences that are bringing human nature back into the picture.
Steven PinkerHuman nature is complex. Even if we do have inclinations toward violence, we also have inclination to empathy, to cooperation, to self-control.
Steven Pinker