What are the consequences of a mortal sin?
A mortal sin “results in the loss of charity and the privation of sanctifying grace, that is, of the state of grace. If it is not redeemed by repentance and God’s forgiveness, it causes exclusion from Christ’s kingdom and the eternal death of hell, for our freedom has the power to make choices for ever, with no turning back” (CCC 1861). This is why it is so important for mortal sins to be confessed to a priest as soon as possible.