Sin harms our relationship with God and damages our communion with the Church. Conversion of heart is the beginning of our journey back to God. Liturgically this happens in the Sacrament of Penance. In the history of the Church, this Sacrament has been celebrated in different ways. Beneath the changes, there have always been two essentials: the acts of the penitent and the acts of Christ through the ministry of the Church. Both go hand in hand. The conversion must involve a change of heart as well as a change of actions. Neither is possible without God's grace. (Source: USCCB)