Gary Anderson is a professor of religious studies at the University of Notre Dame. He specializes in the study of Christianity and Judaism in antiquity. Anderson discusses his book, Sin: A History. In it, he argues that the idea of sin was initially interpreted as something akin to a stain or burden, but gradually became associated with notions of monetary debt. Anderson contends that, as a result of the evolution in the way sin is understood, conceptualizations of how one should remedy his or her sins has also changed.