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“And I myself, in Rome, heard it said openly in the streets, ‘If there is a hell, then Rome is built on it.’ That is, ‘After the devil himself, there is no worse folk than the pope and his followers.’”
Context: Martin Luther’s visit to Rome in 1511.
Source: Wikiquote from “Against the Roman Papacy, An Institution of the Devil” ( Wider das Papstum zu Rom vom Teuffel Gestifft, A. D. 1545)