Twenty years ago, not one nation on earth had legal same-sex marriage. Now, access to same-sex marriage is increasingly seen as a basic human right. In a matter of less than a generation, western cultures have experienced a moral revolution. Dr. R. Albert Mohler examines how this transformation occurred, revealing the underlying cultural shifts behind this revolution: the acceptance of divorce culture, liberation of sex from reproduction, the prevalence of heterosexual cohabitation, the normalization of homosexuality, and the rise of the transgender movement. He then offers a deep look at how the Bible and Christian moral tradition provide a comprehensive understanding upon which Christians can build their personal lives, their marriages, church ministry, and cultural engagement.