In conventional accounts, the emergence of Tolerance during the 1920s is described as a victory of Indian secularism over the intolerant practice of shuddhi "proselytizing", pursued by reformist Hindus of the Arya Samaj, that was threatening harmonious Hindu-Muslim relations. This study shows that the designation of shuddhi as religious proselytizing was not fixed; it was the product of decades of political struggle. The book traces the conditions for the emergence of Tolerance, and the circumstances of its first deployment, by examining the history of debates surrounding Arya Samaj activities in north India between 1880 and 1930. It asks what political considerations governed Indian actors' efforts to represent shuddhi as religious on different occasions; and it asks what was lost in translation when they did. It reveals that by framing shuddhi decisively as a religious matter, Tolerance functioned to disengage Indian secularism from the politics of caste.