It would not be an exaggeration to say that during the last century, most especially during and since the 1960s, the language of spirituality has become one of the most significant ways in which the sacred has come to be understood and judged in the West, and, increasingly, elsewhere. Whether it is true that 'spirituality' has eclipsed 'religion' in Western settings remains debatable. What is incontestable is that the language of spirituality, together with practices (most noticeably spiritual, complementary, and alternative medicine), has become a major feature of the sacred dimensions of contemporary modernity. Equally incontestably, spirituality is a growing force in all those developing countries where its presence is increasingly felt among the cosmopolitan elite, and where spiritual forms of traditional, complementary, and alternative medicine are thriving. This new four-volume Major Work collection from Routledge provides a coherent compilation of landmark texts which cannot be ignored by those intent on making sense of what is happening to the sacred as spirituality-more exactly what is taken to be spirituality-develops as an increasingly important lingua franca, series of practices, and as a humanistic ethicality.