Despite the progress of the Spaniards, it took many years for the natives to truly grasp key concepts of Christianity. In Catholicism, four main sacraments attracted the natives but only for ritualistic reasons, and they did not fully alter their lifestyle as the Spaniards had hoped. Baptism was believed to simply cure ailments, while Matrimony was a concept many natives could not understand and thus they violated the sanctity of monogamy. They were however, allowed to keep the tradition of dowry, which was accepted into law; "bride-price" and "bride-service" were practiced by natives despite labels of heresy. Confession was required of everyone once a year, and the clergy used the "confessionario", a bilingual text aid, to help natives understand the rite's meaning and what they had to confess. Locals were initially apprehensive, but gradually used the rite to excuse excesses throughout the year. Communion was given out selectively, for this was one of the most important sacraments that the missionaries did not want to risk having the natives violate. To help their cause, evangelism was done in the native language.