It was at this point that the practice of indulgences united with the theory of the Sacrament of Penance. The indulgences had to do with the "satisfaction." [19] They might be "partial," remitting only a portion of the penalties, measured by days or years of purgatory; or they might be "plenary," remitting all penalties due in this world or the next. In theory, however, no indulgence could remit the guilt or the eternal penalty of sin,[20] and the purchaser of an indulgence was not only expected to confess and be absolved, but he was also supposed to be corde contritus, i. e., "truly penitent." [21] A rigid insistence on the fulfilment of these conditions would have greatly restricted the value of the indulgences as a means of gain, for the right to hear confession and grant absolution belonged to the parish-priests. Consequently, it became the custom to endow the indulgence-vendors with extraordinary powers. They were given the authority to hear confession and grant absolution wherever they might be, and to absolve even from the sins which were normally "reserved" for the absolution of the higher Church authorities. The demand for contrition was somewhat more difficult to meet. But here too there was a way out. Complete contrition included love to God as its motive, and the truly contrite man was not always easy to find; but some of the scholastic Doctors had discovered a substitute for contrition in what they called "attrition." viz., incomplete contrition, which might have fear for a motive, and which the Sacrament of Penance could transform into contrition. When, therefore, a man was afraid of hell or of purgatory, he could make his confession to the indulgence-seller or his agent, receive from him the absolution which gave his imperfect repentance the value of true contrition, released him from the guilt of sin, and changed its eternal penalty to a temporal penalty; then he could purchase the plenary indulgence, which remitted the temporal penalty, and so in one transaction, in which all the demands of the Church were formally met, he could become sure of heaven. Thus the indulgence robbed the Sacrament of Penance of its ethical content.