Confession is a Sacrament Which Gives Us Grace
The Catholic Church teaches that a sacrament is an outward sign, instituted by Christ, to give grace. Confession, also known as the Sacrament of Reconciliation or Penance, gives us the grace to keep fighting our sinful nature. It is a sacrament of healing.
According to The Catechism of the Catholic Church, “Those who approach the sacrament of Penance obtain pardon from God's mercy for the offense committed against him, and are, at the same time, reconciled with the Church which they have wounded by their sins and which by charity, by example, and by prayer labors for their conversion." (1422)