After the Reformation, Catholics developed new ways to express interior religious experiences, including mystic visions. This article considers the epistemological impasse that arose when the Spanish Inquisition, created to prosecute covert Judaizers, was charged with discernment of mystical experiences. Close linguistic study of interrogations shows how a nondialogue between mystical and legal discourse pointed to a broader conflict between a newly interiorized religion and the public space of the law. Practically, these cases weakened the Inquisition; conceptually, they undermined the idea of an Inquisition. If Enlightenment reformers were able to argue for a secularization of the law, it was because a group of mystics and Inquisitors had made such thought possible.