This incarnation, unlike those already described, has yet to be made. It is the hope of the Hindus, that he who has so frequently visited the earth to restore order and happiness will come yet again to inaugurate a reign of universal goodness, peace, and prosperity. When Vishnu in the form of Krishna reascended to heaven, the Fourth or Kāli Yuga commenced, which, as its name implies, is an age of strife and dissension. In the “Vishnu Purāna” the character of this age is vividly described in words that seem prophetic. At its termination Vishnu is expected to come again, bearing the name Kalki, to put an end to wickedness, and establish a kingdom of righteousness similar to the First or Kritā Yuga—the age of Truth. These four ages, in the same order and with similar characteristics, will again and again be experienced until the final end of all things shall come.
The following extract from the “Vishnu Purāna” will give an idea of the evils of the present age, which Kalki is to remove.
In Magadha a sovereign named Viswasphatika will extirpate the Kshattriya race, elevate fishermen, barbarians, Brāhmans, and other castes to power; whilst Sudras, outcasts and barbarians will be masters of the Indus, Darvika, Chandrabhāgā, and Kashmir. Thekings will be of churlish spirit, violent temper, and ever addicted to falsehood and wickedness. They will inflict death on women, children, and cows; they will seize the property of subjects, be of limited power, and will, for the most part, rapidly rise and fall; their lives will be short, their desires insatiable, and they will display but little piety. The people of various countries intermingling with them will follow their example; and the barbarians being powerful in the patronage of princes, whilst purer tribes are neglected, the people will perish. Wealth and piety will decrease day by day, until the world shall be wholly depraved. Property alone will confer rank, wealth will be the only source of devotion, passion will be the sole bond of union between the sexes, falsehood will be the only means of success in litigation, and women will be the objects merely of sensual gratification. Earth will be venerated only for its mineral treasures (i.e. no spot will be peculiarly sacred); the Brāhmanical thread will constitute a Brāhman; external types will be the only distinctions of the several orders of life, dishonesty will be the universal means of subsistence, weakness will be the cause of dependence, menace and presumption will be the subterfuge for learning, liberality will be devotion, simple ablution will be purification (i.e. gifts will be made from the impulse of ordinary feeling, not in connection with religious rites or as an act of devotion, and ablution will be performed for pleasure or comfort, not religiously with prescribed ceremonies and prayers). Mutual assent will be marriage, fine clothes will be dignity, and water afar off will be esteemed a holy spring. The people, unable to bear the heavy burdens imposed upon them by their avaricious sovereigns, will take refuge among the valleys, and be glad to feed upon wild honey, herbs, roots, fruits, flowers, and leaves; their only covering will be the bark of trees, and they will be exposed to cold and wind, and sun and rain. No man’s life will exceed three-and-twenty years. Thus in the Kāli Age shall decay flourish, until the human race approaches annihilation.” It is rather strange that the condition of men, in what appeared to the writer of this Purāna as the most miserable he could imagine, where their dress was bark and their food consisted of roots and fruits, was in the earliest ages regarded as the most desirable. It was thus the old Rishis lived, who are held in the greatest esteem.
“When the practices taught by the Vedas and the institutes of law shall nearly have ceased, and the close of the Kāli Age shall be nigh, a portion of that divine being who exists of his own spiritual nature in the character of Brahmā, and who is the beginning and the end, and who comprehends all things, shall descend upon the earth. He will be born in the family of Vishnuyasas, an eminent Brāhman of Sambhal village, as Kalki, endowed with the eight superhuman faculties. By his irresistible might he will destroy all the Mlechchhas (outcasts), thieves, and all whose minds are devoted to iniquity. He will then re-establish righteousness upon earth; and the minds of those who live at the end of the Kāli Age shall be awakened and be made pellucid as crystal. The men who are changed in virtue of that particular time shall be as the seeds of human beings, and shall give birth to a race who shall follow the laws of the Kritā Age, or Age of Purity.”
In the descriptions of Kalki, and in pictures, he is represented as a white man riding upon or bowing down before a white horse, and with a sword in his hand: he is the purifier of the present degenerate age, and the restorer of purity and goodness.
Kalki Puran convincingly explains how will this world end.
The last of the Dasa Avatars of Lord Vishnu, named Kalki will be born to a brahmin family in a village named Sambhala, near the end of Kaliyug. At the time of His birth there will be very less good people left on earth.
As per Vedic Cosmology (Vishnu Purana , Srimad Bhagavatam and other scriptures) we know that Kaliyuga is 4,32,000 years long. It commenced 5000 years ago with 5,000 more years of 10,000 years of Golden Age of initial portion of Kaliyuga.
We are fortunate to live in the first 10,000 Golden years of this age where people still have a little bit of conscience following some sort righteousness or Dharma.
After the golden years of the first 10,000 years, there will be total darkness due to evil taking over the world.
After the birth of Kalki, He would remain in his village learning about the world and how it has fallen into darkness. At this time the 7 Chiranjeevis (immortals) namely:
1. Sage Vyasa
2. King Bali
4. Parshuram (who will actually teach kalki the art of fighting and weapon handling capability)
will teach Kalki about everything he should be imparted, from the beginning of SatYuga to the things he will needs to know currently to get rid of evil in this world.
After receiving appropriate training Kalki will head north where he will defeat a king named Jin (head of China). The battle will be fierce as Jin would never follow any battle rules and he will have a very big army (reference may be probably due to the population boom of China and military strength).
After winning Jin he will go on to fight all the dictators and evil doers of the world and kill all of them.
With the death of these evil doers, the cycle of four yugas will again recur in sequence. Kalki would bring back the Sat yuga back where everything will start again from beginning and the sport of the Lord will start with the help of Maya.
The circle of life will be complete and the universe will start over.
In terms of science, Kalki Puran explains the events of creation and destruction with the story of Kalki Avatar. Time began with Big Bang, and would end with Big Crunch, only to be started again with another Big Bang. This cycle is endless (eternal).