Envy lies in the basis of the material existence. This feeling devours all good qualities of jiva. Everybody in the material world is envious. Those free from envy do not come to this world (the exception is only for Lord’s servants sent by Him to open the way back home to all willing it). "I’m better, I’m more worthy". With this spirit, jiva cannot stay in the spiritual world any more. From these personalities, the Lord immediately “hides”, hides His devotees and gives the former the possibility to make their own society. This possibility is this very material world. One who does not understand the nature of envy will never be able to become an Aryan. One who does not accept this truth about the material existence will never be able to develop this system of values common for the Aryans. Therefore, having created the material world and given us the possibility to realize our desires, the Lord in fact becomes our servant putting at our disposal His material energy with which we can do whatever we want.
But this freedom of action becomes a heavy burden on the shoulders of a small living being who immediately loses the culture of relationships with other living beings attributable to the spiritual world and understands how in fact the Lord’s “job” is difficult. Trying to imitate God but not capable of being just, a living being gets entangled in the knots of sinful activities and becomes an eternally conditioned (i.e. deserving to stay in the material prison) jiva (soul) doomed to sufferings for causing sufferings to other living beings. Figuratively, the Aryans see the material world as a prison designated for envious souls. One way or another, this concept is supported by all religious movements.
There is one more question to be answered. What determines unequal birth conditions of all living beings? How to explain that one is born rich, another is born poor, another is healthy and another is ill and so on? The answer on this question is given only by the reincarnation concept. By nature, jiva is eternal. Having descended to this material world, it stays here for a very long time, practically eternally. As the result of various activities it gains certain amount of reactions becoming the author of its own destiny. For instance, in this life we eat bodies of many animals and in next lives these animals will have the possibility to eat us. Thus, the rule “as you sow so you reap” is implemented, not within one life, but from life to life. The fact is that in practice we can often see that a person commits what is known as sins without any punishment. The secret that lies beneath is that the punished for committed evil are all those who are born in poverty, born to bad parents, without opportunity to get education, who are ugly, have congenital diseases, who are under malicious state prosecution, etc. But that brings up the question: why cannot we remember our past lives? The answer should be found in the Lord’s noble nature. The Lord is merciful and He is not interested in artificial processes of jiva’s return to Him. Jiva itself is so much entangled in its efforts to take the Lord’s position by trying to predominate and enjoy that it is practically doomed to living in the material world forever. And yet, despite the amount of sufferings jiva does not stop wanting power and enjoyment, therefore it still desires to be in this world. To satisfy this desire, the factor of the memory loss about past lives is simply a must.
As an example, we can imagine that in the past life one was a man and he was very attached to women. Attached so much that at the time of death he was thinking about them. According to the reincarnation law, in the next life he will be born in the body of a woman. And now imagine that in the woman’s body one remembers the past man’s life. Could it be possible with this memory be a sane woman? Therefore, the Lord arranged it so that a wise person who eyes are balmed with the Vedic knowledge can clearly see the reincarnation law, but an ignorant and attached to material existence person simply reaps the fruits of actions “enjoying” their good and bad consequences. The memory loss, thus, is necessary for us to peacefully enjoy these fruits. The presence of the memory would cast us in horror. Paralyzed by the memory, we would immediately strive back to God but at this point we would not have solved the paramount problem: the problem of envy. Then getting to the spiritual world and coming to ourselves, we would promptly repeat the same mistake and have to return to the material world again.