In "Until I Find You," John Irving explores the concept of sin through a character named Jack. The quote reflects on the diverse perspectives people have regarding sin, indicating that for some, it holds significant importance, while others dismiss its existence entirely. This contrast highlights the complexity of moral beliefs and how they vary among individuals. Irving's narrative invites readers to examine their own views on morality and the existence of sin. By presenting these differing attitudes, he encourages a deeper reflection on personal ethics and the societal influences that shape our understanding of right and wrong. Ultimately, the quote encapsulates a profound philosophical debate about morality’s relevance and its interpretation in modern life.