Say one has already numerously commited mortal sins, such as looking upon a woman lustfully or watching a film, (and aside from these actions lives a pretty sin free life) and has fully been aware of knowing it was a mortal sin, then matures spiritually and emotionally and regrets their actions and decisions and wishes to seek forgivness and leave those habits behind, will God forgive that person? Or has the damage been done and all the prayer and change of viewing life cannot change their outcome?
As long as there is life there is hope. As long as you live you can repent mortal sin, up to the very last moment, and you should do so as soon as you can and reconcile yourself to the Lord Jesus Christ who died for your sins, to bring to you salvation in Him.
Hate sin, love God, repell these desires from your life with disgust and sorrow, and then glory in their opposite, the purity and peace of the Lord.
A good confession, and a good prayer of sorrow and repentance to the Lord beforehand will begin your journey home.
He waits with open arms of forgiveness.
Act of Contrition
O my God, I am heartily sorry for having offended Thee and I detest all my sins because of Thy just punishments, but most of all because they offend Thee, my God, who art all good and deserving of all my love. I firmly resolve, with the help of Thy grace, to sin no more and avoid the near occasions of sin.
Asperges Me
Thou shalt sprinkle me, O Lord, with hyssop and I shall be cleansed; Thou shalt wash me, and I shall become whiter than snow. Have mercy on me, O God, according to Thy great mercy.
Holy Water Prayer
By the sprinkling of Thy Precious Blood, O Lord Jesus Christ, and by the merit of thy Passion, wash me from every stain, and cleanse me from all sin.
I recommend devotion to Mary and the Ave Maria as the foundation for acquiring a love of purity and the virtue thereof.
