High Quality Content by WIKIPEDIA articles! Vix Pervenit: On Usury and Other Dishonest Profit was an encyclical, promulgated by Pope Benedict XIV on November 1, 1745, which condemned the practice of charging interest on loans as usury. Because the encyclical was addressed to the Bishops of Italy, it is generally not considered ex cathedra. The Holy Office applied the encyclical to the whole of the Roman Catholic Church on July 29, 1836, during the reign of Pope Gregory XVI.