This article presents a case of conflict and resistance within the Catholic Church: that of Carlo Passaglia (1812–87). It aims to show that although the conflict is usually attributed to Passaglia's liberal political ideas, it was actually rooted in his innovative ecclesiological model. In turn the article presents the origin of the conflict, an account of Passaglia's theological point of view and, finally, how Passaglia lived this conflict and the particular form of resistance that he elaborated.