The Church has the power to forgive all sins. This forgiveness of sins is a true sacrament instituted by Christ, different from baptism, particularly on account of its judicial form. Sins are forgiven only by the sacrament of penance. Sins are forgiven by absolution which can only be given by an authorized priest. It is a real judicial pardon. The Church has the power to reserve certain cases. On the part of the sinner contrition, confession and satisfaction are required. Contrition is aversion to the sins committed. Perfect contrition remits sin even before confession if it is joined with the intention to confess. Imperfect contrition (attrition) is sufficient if there is confession, and is a good and salutary thing. Confession must cover all mortal sins committed since baptism and not previously confessed. Venial sins, and sins already confessed can validly be confessed. And satisfaction. The effect of the sacrament is recon- ciliation with God, that is, the remission of sins and the eternal punishment but not all the temporal punishment.