The Lord specifies to this effect: These, being reborn life after life within the demonic species, never can approach Me. Gradually they sink into the most sinister condition.
In truth, we all know that God shows infinite mercy, but He never makes it appear to evil and demonic men. These ungodly men are forced, life after life, to enter the family bosom of beings just as demonic as themselves. Thus, deprived of the mercy of the Lord, they sink more and more, to end up in the bodies of dogs, cats, pigs…
These evil and demonic men have practically no chance of receiving, in the present as in the future, the mercy of God. They degrade themselves until they are forced to incarnate in the bodies of dogs, cats and pigs among others.
In all, Krishna, God, the Supreme Person is impartial, and has no hatred or resentment for no one. He has equal consideration for all living things. The act of placing evil and demonic beings in the lowest life forms is in fact just another aspect of his mercy. It sometimes happens that demonic men are killed by the Lord, but such an act is actually beneficial to them, for whoever is put to death by the Lord attains liberation. All acts of God are absolute. The mercy of God is therefore also manifested to demonic men, if they are fortunate enough to be slain by Him.
The Supreme Lord teaches us: Three doors open into this hell: lust, anger and greed. Let every sane man close them, because they lead the soul to its destruction.
This word of God describes there the origins of demonic life. Human beings seek to satisfy their lust, and if they do not, then anger and greed arise. This is why the healthy man, who does not want to fall into the demonic species, must try to get rid of these three enemies capable of “tuer”, to suffocate the soul, to the point of taking away from it every chance to free oneself from the traps of material existence.
Aversion to the principles which allow one to know Krishna, God, the Supreme Person, is for human society the cause of all falls. In this aversion lies the worst offense that a human being can commit. As a result of this offense, maya, the material energy of the Supreme Lord, continually imposes on souls conditioned by matter, in the form of the three kinds of suffering [those arising from the body and the mind, those caused by other living entities, and those which originate in material nature; hurricanes, storms, high winds, heavy rains, extreme cold, etc.], countless setbacks.
This material energy consists of the three attributes and modes of influence of material nature; virtue, passion and ignorance, and one must rise at least to virtue before entering the path which leads to the knowledge of the Supreme Lord.