One Common Faith analyzes the assertion that “the time has come when religious leadership must face honestly and without further evasion the implications of the truth that God is one and that . . . religion is likewise one.” In the document commissioned by the Universal House of Justice, we will look at the nature and results of the dominance of materialism in the modern world; the consequences of global integration; and the failure of the world’s past religious systems to deal with the crisis of modernity. We will also discuss what it says about the Bahá’í principles that make the Bahá’í approach effective: the impact of progressive revelation on understanding religious systems and their efforts to civilize humanity; and the power of unity in reforming civilization and the nature of the forces that oppose it. Finally, we will examine what the document explains about the efforts the Bahá’í community must make to become an effective agent of change and lead the world to one common faith. Our study of One Common Faith will provide a foundation for teaching, for interfaith dialogue, and for contributing to public discourse.