The Purpose is to re-establish religious principals
At the end of the Dwapar Yuga, when Lord Shri Krishna ended his pastimes in this world and went to Goloka, at that time Kali Yuga, the source of all chaos took birth in the mind of the people in general. When king Yudhishtir realized the advent of the age Kali Yuga , he expressed a desire to go to the forest and do penance. Accordingly, he abdicated the throne and coronated his grandson Parikshit as the king.
When the personified Kali Yuga met king Parikshit, he was shivering with fear and said humbly:" O king! Brahma created 4 cycles of time that are Satya, Treta, Dwapar and Kali Yuga. Satya Yuga enjoyed his reign for 17,28,000 years and went away. Treta Yuga enjoyed his reign for 12,96,000 years and Dwapar Yuga enjoyed his reign for 8,64,000 years and passed away. Now the time for me has come to thrive which is 4,32,000 years and you tell me to get out from your empire, why ? You rule over the entire world. Where should I go ? O king! What is once proposed by the Gods cannot be erased or eliminated." Kali Yuga told Parikshit that:" You point your fingers on my flaws and demerits but do not see my merits and positive aspects. I am embellished with sublime merits. That is the reason I request you.
During the Satya Yuga if any one inadvertently committed a wrong deed the entire kingdom had to bear the punishment.
During Treta, if any one committed a wrong deed, the people of that town had to bear the punishment.
During Dwapar Yuga, if anyone happened to commit a wrong deed, the entire family had to bear the punishment, but in Kali Yuga, he shall only bear the punishment who has committed the wrong deed.
I am not concerned about anyone else." Unlike the other ages where one had to inevitably bear the punishment for a wrong and bad thoughts, In my age, this shall cease to happen but one shall be bestowed with good fruits who thinks good." Even after listening to this, King Parikshit did not relent,
Kali Yuga said that he was endowed with yet another sublime merits. He said:" One could fulfill all ones wishes and desires in the Satya Yuga only after practicing penance for 10,000 years. Similarly in the Treta Yuga and the Dwapar Yuga, one had to collect a lot of money and perform Yagyas and had to engage in charity, penance, vows and worship for a 100 years respectively to fulfill ones desires.
Unlike the others, in this era, if one even prays to God for sometime with total faith and devotions and sings the praises of the Lord, he shall fulfill all his desires within no time. He shall be liberated from all his sins and shall consequently have the opportunity to return back to home back to godhead"
Listening to this King Parikshit was pleased. King Parikshit finally allowed Kali Yuga to stay and allowed him four places where he could live. Where liquor and wine, where a prostitute stays, where there is animal slaughter and where gambling is, in those places he would be allowed to live and thrive.
Kali Yuga humbly pleaded that his family was very big and that it comprises members like lust, anger, greed, ego, jealousy, lies etc. How shall all of them fit in these allotted places? On this king Parikshit said that they should all then dwell in gold. In this way, Kali Yuga resides in the 5 places allotted by king Parikshit. Those people who yearn for higher ideals should not even go near these five things. In the Kali Yuga, by seeking the blessings of Lord Jagannath Puri, one shall attain salvation. And by taking shelter of Sri Caitanya mahaprabhu by chanting the holy names of the lord one can return back to godhead.
In the Kali Yuga, there is no average life expectancy of humans. Even a child in the womb can die inspite of his mother and father living.. Humans taking birth in this age will usually be easily angered, bad tempered, greedy and untruthful. The personality will be plagued by flaws such as jealousy, ego, anger, pleasure, nasty instincts, desires and greed.
There shall be only one pillar of religion in the Kali Yuga. Vedic conduct, religion, Yagna and Karma all cease to exist. All types of problems such as ailments, lethargy, anger, mental diseases and hunger, thirst tend to aggravate. Gradually even happiness and comforts of humans become decadent and morbid. In this age Brahmins do the work of a Sudra and the Sudras alike the Vaishyas amass wealth or alike Kshatriyas engage in allied activities and earn their livelihood. In Kali Yuga, Brahmins shall renounce self-study, contemplation and shall eat every thing that is prohibited. They will no more be inclined towards penance and on the contrary Sudras shall take interest in recitation of Vedic chants. In this way when hypocrisy reaches the zenith, it initiates the final annihilation. Many a king of the inferior category shall reign the earth who shall be sinners, unfaithful and wicked. Kings of places such as Andhra, Shaka, Pulunda, Yavan, Kamboj, Bahrhik and other wealthy lands shall become kings.
No Brahmin in this age shall earn his daily bread and butter honestly. Kshatriyas and Vaishyas shall engage in all duties other than those, which are coveted. All shall become less valiant, they shall be short lived, will lack energy and strength.
Humans shall be short in height and shall seldom speak the truth. All the directions will have snakes and animals. Some people will meaninglessly talk of Brahma Jnana. Sudras shall criticize the Brahmins while the Brahmins shall praise and eulogize the Sudras. Many a creatures, insects etc. shall take birth in Kali Yuga. All things that ought to have fragrance shall not be that fragrant, and food shall relatively become tasteless with poor nutritional value. Women shall be short and have many children. Women in this era shall be immoral and licentious by nature.
Most people shall be traders of food while Brahmins shall sell the Vedas. Most of the women shall engage in prostitution. In the Kali Yuga, there will be very less milk in the udders of the cow. Seldom will there be fruits and flowers on trees. There will be excessive number of crows in comparison to other birds. Brahmins will engage in killing and shall take donation from kings inspite of lying. Brahmins as a whole shall be impostors and pretend to be very pious and pure. They will harass the common people for donations etc. Householders shall indulge in robbery because they will be unable to pay their taxes.
They shall disguise in the dress of sages, ascetics and earn their livelihood. Even people who are celibates shall give up their purity and engage in intoxication and shall have illicit sex.
People will engage in material activities that use physical energy only the mental and intellectual energies will be waited.
All Ashrams shall be a haven of all impostors and they shall be totally dependent on food from others.
During this time, seldom shall it rain and even the yield, production of grain will not be satisfactory. People will be aggressive by nature and consequently unholy and impure. The ones indulging in irreligious and blasphemous acts shall emerge powerful and prosperous. Those who are righteous shall be in poverty. Just by amassing a little amount of wealth one shall become proud and they despite having wealth shall have an eye on others wealth and property.
In Kali Yuga, girls, 8-10 years old shall become pregnant while boys of the age of 10-12 years shall have children. On the sixteenth year itself the hair will turn white. Youth shall become alike old men and old men shall become energetic and youthful. Women will engage in sex with inferior men, servants and animals inspite of having a good husband. Religion, truth, pure thoughts, pity, age, energy, memory all shall get gradually emaciated and drained.
People will love only their own children and family and will not hesitate to deceive their own friends, benefactors. Judges of events shall favor the wealthy and the impoverished shall be denied justice.
One who constantly blabbers shall be called a saint and one who is in a miserable state will be called an impostor.
Any lake or reservoir situated far away will be referred as a holy shrine. Growing hair will be an indication of beauty. People will take interest in religious actions so as to become prosperous and successful. He who subdues the others shall be self-proclaimed king. Subjects to protect their families shall seek refuge in caves and caverns and will lead a miserable life. People will be plagued with all types of extreme climatic conditions. Average life expectancy of a human being in Kali Yuga will be approximately 20 to 30 years only.As the delusion will aggravate people will become weak and devoid of radiance, medicines and food will plummet and all the four stages (Varnashrams) will be represented by Grihastashram (householder's duty).
By the end of the Kali Yuga, The personality of godhead will appear to protect religion and to destroy all evi doersl. Lord Vishnu shall appear and shall give refuge to all that are good and righteous.
When Sun, Moon and Jupiter together enter the Pushya Nakshatra and cancer zodiac at that time by the inspiration of time, a divine and strong child named Vishuyasha Kalki shall take birth in a Brahmin family in a village known as Sambhal. He shall be the savior of one and all and he will possess weapons on the spur of the moment. He shall emancipate this world from all miseries and create happiness. He will put an end to the Kali Yuga and shall create a Satya Yuga embellished with truth and beauty. Bhagwan Kalki shall recoronate all the Brahmins as the rulers and will massacre all the outcasts and inferior (barbarians) .