How did Fausto Sozzini turn the Bible itself into a tool for arguing against the Trinity? This episode reconstructs the intellectual climate that made Sozzini a singular figure: the Polish Brethren's refuge, the influence of his uncle Lelio, controversies sparked by Servetus' execution, and the texts — and textual judgments — that shaped his approach. We trace the historical roots of his method: a rigorous appeal to Scripture's plain sense, close attention to language and context, and a willingness to reject later textual additions. Primary sources like the Racovian Catechism and Sozzini’s letters illuminate how a small, embattled minority recast Christian dogma.