The spiritual effects of the sacrament of Penance are:
- reconciliation with God by which the penitent recovers grace;
- reconciliation with the Church;
- remission of the eternal punishment incurred by mortal sins;
- remission, at least in part, of temporal punishments resulting from sin;
- peace and serenity of conscience, and spiritual consolation;
- an increase of spiritual strength for the Christian battle.
Source: Catechism of the Catholic Church (Vatican.va)