Catholic theology distinguishes two types of sin: Mortal sin destroys the life of grace in the soul and, if unrepented, leads to eternal separation from God. Three conditions must all be met: (1) grave matter — the act itself is seriously wrong, (2) full knowledge — the person knows it is gravely wrong, and (3) deliberate consent — the person freely chooses to do it anyway. Examples include murder, adultery, and missing Mass on Sunday without serious reason. Venial sin weakens but does not destroy the relationship with God. It involves less serious matter, or lacks full knowledge or complete consent. Venial sins are forgiven through prayer, the Eucharist, and acts of charity. Mortal sins require sacramental Confession for forgiveness.