What is distinctive about ministry in an immigrant community, and how has it changed or remained the same over the last 150 years? What happens to the individual and communal religious identity of immigrants in the process of assimilation into the dominant denominational and social culture? On to Perfection explores a neglected doctrine and a largely forgotten chapter in Methodist history through the eyes of Nels O. Westergreen, a nineteenth-century Swedish immigrant preacher in the United States.