Those in heaven enjoy the happiness each person was created to have. But, those is hell are full of the regret that they did not become the person God created them to be--His son or daughter forever happy with Him in heaven.
Pray for those who are in mortal sin. Pray for those who have left the Church. Do penance for unbaptized adults and children who fall so easily prey to Satan.
This lack of the vision of God is the destiny of the unrepentant.
To realize, in some measure, how great this pain of loss is, we should bear in mind that we have been created by God to be forever happy. This love of happiness, this yearning for it, which every one of us feels in his heart, will never be destroyed, not even in Hell. During this life men, impelled by this desire and blinded by passion, seek happiness in riches, in honours, in sensual gratification. These vain images of happiness deceive us so long as our soul is united with our body. But after the soul has severed her connection with the body, all these false, fleeting pleasures disappear, and she becomes aware that God alone is the source of all happiness, and that she can find happiness solely in the possession of Him.
I would think that seeing all the opportunities for grace and virtue which one passed up while on earth would be some of the pain of hell. Self-knowledge, and the Knowledge of Divine Things, including the Beauty of God as beyond one's grasp forever would be the worst pain of all.
No longer deceived by false appearances, no longer blinded by passion, she perceives clearly the ineffable, ravishing beauty of God and His infinite perfections ; she sees His infinite power in creating the world, His infinite wisdom in governing it, His excessive love for her in be coming man, in dying for her, in giving Himself to her as the food of her soul in the Blessed Sacrament, in destining her to share His own happiness forever in Heaven. This knowledge of the grandeur, of the goodness and loveliness of God will remain deeply impressed on her for all eternity. She will also see the justice of the punishments which God inflicts forever in Hell upon all those who do not keep His commandments.
Unfulfilled desire is the lot of the damned. We are only happy in God.
Then the reprobate soul, yearning after happiness, and feeling irresistibly drawn to God, who alone can make her happy, endeavours to rush to God with all the impetuosity of her nature, in order to behold Him, to enjoy Him, to be united to Him; but she finds herself repelled with infinite force from God, and hated by Him on account of her sins. Were all the riches, honours and pleasures of the world now offered to that soul, she would turn away from them, and would even curse them all, for she yearns for God alone, and can be happy only in God.
The reprobate soul in Hell, spurred on by frightful pains, looks about her for some alleviation, for some word of comfort; but not even a sympathizing look greets her, for she is surrounded by cruel devils and bitter enemies. Not meeting with any compassion where she is, she raises her eyes to Heaven, and beholds it so beautiful, so enchanting, so delightful, so full of true happiness. She remembers that she was created and destined to enjoy its bliss, and now, in the midst of her most excruciating pains, she longs for its pleasures with a still more indescribable yearning, and makes extraordinary efforts to go there, but she cannot leave her abode of torment.
Trapped in suffering forever...but, now, we can repent, we can change.
Now is the time for contrition, mortification, reparation, new life through the sacraments of the Church.
We only have the "now".
No one in Heaven seems to take any notice of her. She sees the throne that God, in His goodness, had prepared for her, now occupied by someone else ! There is no longer any room for her in Heaven. She beholds there some of her relatives, of her companions and acquaintances; but they do not heed her. She beholds all the elect in Heaven full of joy and gladness. They do not even sympathize with her, but as the Psalmist sings, "the just will rejoice when he shall see the revenge" (Ps. Ivii. ii).
In vain the reprobate soul calls on the Saints, on the Blessed Virgin and on our Divine Saviour Himself. She feels drawn to God by an irresistible impulse, and understands that God alone can quench her thirst for enjoyment and make her happy. She longs to see and possess Him; she repeatedly endeavours to spring towards Him, but she feels herself repulsed by Him with invincible force; she beholds herself the object of Divine wrath, of the Divine anathema. She is aware that her case is hopeless, and that she shall never be admitted into the mansions of the blessed, or leave the abode of endless misery.
Despair seizes her; she utters the most fearful imprecations against God and the elect, against Heaven, against herself, her parents, her companions, against all creatures. All Hell resounds with her horrid blasphemies, and she becomes, in her ravings, an object of terror to all the other reprobates.
Such is the loss of God...the tormented become tormentors to others.
One more post on compunction....