The Act of Contrition is part of the Sacrament of Penance and is prayed by the penitent after the priest assigns a penance and before he gives the penitent absolution.<br /><br />The Catechism of the Catholic Church states the following...<br />"Among the penitent’s acts contrition occupies first place.<br />Contrition is “sorrow of the soul and detestation for the sin committed, together with the resolution not to sin again.” When it arises from a love by which God is loved above all else, contrition is called “perfect” (contrition of charity). Such contrition remits venial sins; it also obtains forgiveness of mortal sins if it includes the firm resolution to have recourse to sacramental confession as soon as possible." (CCC 1451–1452)<br /><br />“Excerpts from the English translation of the Catechism of the Catholic Church for use in the United States of America Copyright © 1994, United States Catholic Conference, Inc. -- Libreria Editrice Vaticana. Used with Permission. English translation of the Catechism of the Catholic Church: Modifications from the Editio Typica copyright © 1997, United States Conference of Catholic Bishops—Libreria Editrice Vaticana.”