The sacrament of Penance has undergone some development over the years. These days if you commit a serious sin and go to confession, you might be given a penance of one Our Father and three Hail Marys but it hasn’t always been like this. Back in the early days (even before the A.D. 300s) if a Christian committed a serious sin, he had to confess his sin, receive absolution and do penance (temperal punishment due to sin) and his period of penance in those days might last for years, such as fasting on bread and water for 5 years (a made up example). Only after completing his period of penance would a penitant be readmitted to Holy Communion. Hundreds of years later, the performance of pious acts, such as praying the Psalms and giving alms to the poor, was recognized as suitable substitutes for at least some of the penance. This is pretty much what an indulgences is, pious acts done to lessen or eliminate one’s period of penance. Today, there are only two kinds of indulgences, partial or plenary (full) but not too long ago the indulgences for certain prayers or other pious acts were designated by the number of days they would shorten the penitant’s period of penance. In addition to indulgences involving prayers and giving alms to the poor, some indulgences were granted by the pope or the bishop for the performance of certain pious acts, such as going on a pilgrimage to a particular church or city, going on a crusade to the Holy Land, or donating money for the restoration of St. Peter’s Basillica. (It was abuses associated with this last example that caused so much trouble about the year 1500 with Martin Luther but that’s another story.) Because indulgences shortened or eliminated a penitant’s period of penance (the temperal punishment due to sin), those who committed grave sin could be reconciled to God and the Church more quickly through the use of indulgences.