During the Counter-Reformation in southern Europe, Catholic Church officials developed rules to legitimize miracles performed by candidates to sainthood. The Rationalization of Miracles uncovers a tacit understanding between central religious officials and local religious activists. Each group had a vested interest in declaring miracles: Catholic Church leaders sought legitimacy in the wake of the crisis of faith created by the Protestant Schism and religious acolytes needed Church approval to secure a flow of resources to their movements. The Church's new procedure of deeming miracles true...