Imam Khomeini sheds the light on the matter through his theological works as following:
But as for your life in Barzakh (the Purgatory), if you depart, God forbid, without reforming yourself, God alone knows what conditions and states will be prescribed for you therein.
Perceptions of the inhabitants of this world are incapable of seeing, hearing, and smelling the affairs of that world. Whatever you hear of the darkness, the dreads, and the pressures of the grave, you compare them with this-worldly dreads and pressures, but you are mistaken. O God, help us, and rescue us from the calamity of what we ourselves have prepared with our own hands.
The punishment of the grave, which is a model of the punishment in the Hereafter-and according to some traditions we will not be able to avail in the Barzakh any intercession of the intercessors-God alone knows what kind of punishment it will be!
The state of affairs on the Day of Resurrection will be worse and more dreadful than all the past phases. It will be the day of the revelation of secrets, the manifestation of truths, and the day of the embodiment of morals and actions. It will be the day of reckoning and the day of disgrace. Such is the Day of Resurrection!
As to the conditions of the hell after the Day of Resurrection, they are also known to you. Would you like to know more about the hell?
The punishment of hell will not be confined to the torments of fire alone; a dreadful door will be opened to your eyes, which if opened to this world its dread will destroy all of its inhabitants. A similar door will open to your flesh, another to your nose, each of which will be sufficient to kill the inhabitants of this world.
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One of the experts in the knowledge of the Hereafter says that in the same way as the heat of hell will reach the climax of its extremity, its coldness will also be at the highest point of coldness.
God Almighty is capable of bringing together these two extreme opposites, Imam further explained.
Such are the dreads of the Hereafter. In the light of all this, one whose beginning lies in infinite nothingness; one who from the point he steps into the world of existence, all whose stages of development are ugly and indecent; all whose states are shameful; whose conditions in the world, the Purgatory and the Hereafter, each one is more horrible and disgraceful than the other-what reason has he for pride?
What merit or glory makes him so boastful? Therefore, those whose ignorance is more and whose rational faculties are more defective, are more proud of themselves; and those whose knowledge is greater, whose souls are more capacious, and whose breasts are spacious-they are humbler and more modest.
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Morality and character are provisions of human's journey, Imam Khomeini explained