A brilliant painter of society portraits, John Singer Sargent also devoted many years at the height of his career to a project of an entirely different order: an ambitious, multi-media decoration titled Triumph of Religion (1890-1919) for the Boston Public Library. The library cycle Sargent imagined as his most important work, however, would ultimately remain unfinished, quietly abandoned in the face of religious opposition, one critical painting short of completion. Truncation dramatically altered possible readings of Triumph, redirecting its narrative energies and generating new meanings in tension with the idea Sargent had proposed. In Painting Religion in Public, Sally Promey tells the story of an artist of international stature and the complex and consuming pictorial program he pursued in Boston. Highly celebrated in its day, with individual panels retaining immense popularity even in the years of discord, this artistic project and its constituent images tell us much about broad cultural and political exchanges concerning the public representation of religious content in the United States. Sargent's library decoration attracted the attention of multiple audiences and engaged concurrent debates about class, race, art, and religion. Representatives of various religious and cultural backgrounds hailed portions of the cycle as indicative of the strength of their own positions, and reproductions of the images appeared in everything from books and encyclopedias to stained glass and public pageantry. Promey analyzes the conception and production of the cycle, persuasively demonstrating that Triumph of Religion, far from promoting a narrowly sectarian version of religious practice, represented instead Sargent's public recommendation of the privacy of modern belief. The artist recast contemporary religion as spirituality, she argues, linking it not with institutions and dogma but with personal subjectivity. For Sargent, this ideal was a sign of Western, especially American, progress. Carefully reconstructing patterns of reception in an increasingly diverse religious climate, and exploring the extent and character of Sargent's personal and artistic investment, Promey boldly illuminates the work Sargent hoped to make his masterpiece. At the same time, she enriches understanding of religious images in public places and popular imagination.