The answer from God’s word:
“The work of managing mankind is divided into three stages, which means that the work of saving mankind is divided into three stages. These three stages do not include the work of creating the world, but are rather the three stages of the work of the Age of Law, the Age of Grace, and the Age of Kingdom. The work of creating the world was the work of producing the whole of mankind. It was not the work of saving mankind, and bears no relation to the work of saving mankind, for when the world was created mankind had not been corrupted by Satan, and so there was no need to carry out the work of mankind’s salvation. The work of saving mankind only began once mankind had been corrupted, and so the work of managing mankind also only began once mankind had been corrupted.”
from “Knowing the Three Stages of God’s Work Is the Path to Knowing God” in The Word Appears in the Flesh
“The significance, purpose, and step of Jehovah’s work in Israel were to begin His work on the whole earth, gradually spreading to other nations from its center in Israel. This is the principle according to which He works throughout the universe—to establish a model, then broaden it until all people in the universe have accepted His gospel. The first Israelites were the descendants of Noah. These people only had the breath of Jehovah, and could take care of the basic necessities of life, but they did not know what kind of a God Jehovah was, nor did they know His will for man, much less how they should revere the Lord of all creation. Adam’s descendants did not know what rules and laws they must obey, or what work the created must do for the Creator. All they knew was that the husband must sweat and labor to provide for his family, and that the wife must submit to her husband and perpetuate the race of humans that Jehovah created. In other words, this people had only Jehovah’s breath and His life, but did not know how to follow God’s laws or how to satisfy the Lord of all creation. They understood far too little. So although there was nothing crooked or cunning in their hearts, and though they seldom had jealousy and strife, they did not know or understand Jehovah, the Lord of all creation. These ancestors of man knew only to eat what Jehovah made, to enjoy what Jehovah made, but they did not know to revere Jehovah; they did not know that they should worship Him on bended knee. How could they be called His creatures? And so, were not the words, ‘Jehovah is the Lord of all creation’ and ‘He created man as an expression of Himself, to glorify Him and represent Him,’ spoken in vain? How can people who do not revere Jehovah be a testament to His glory? How can they be expressions of His glory? Do not Jehovah’s words ‘I created man in My image’ then become a weapon in the hand of Satan—the evil one? Do these words not then become a mark of humiliation to Jehovah’s creation of man? In order to complete that stage of work, Jehovah, after creating mankind, did not instruct or guide them from Adam to Noah. It was not until after the flood that He formally began to guide the Israelites, who were the descendants of Adam and of Noah. His work and words in Israel guided the lives of all the people across the land, showing them that Jehovah was not only able to blow breath into man, so that he had His life, and was resurrected from the dust and made a creature of God, but could also scorch mankind with flames, and curse mankind, using His rod to govern mankind. So, too, did they see that Jehovah could guide man’s life on earth, and speak and work among them by day and by night. He did the work only so that His creatures might know that man came from dust picked up by Him, that man was made by Him. Furthermore, the work He began in Israel was meant so that other peoples and nations (who in fact were not separate from Israel, but had branched off from the Israelites, yet were still descended from Adam and Eve) might receive the gospel of Jehovah from Israel, so that all creatures in the universe would revere Him and hold Him to be great. Had Jehovah not begun His work in Israel, but instead, having created mankind, let them live carefree lives on the earth, then because of man’s physical nature (nature means that man can never know the things he cannot see, that is, that he does not know that Jehovah created mankind, let alone why He did so), he would never know that Jehovah created mankind and is the Lord of all things. If Jehovah had created man and placed him on the earth as His enjoyment, then simply dusted off His hands and left rather than leading among man for a period of time, then all humanity would have returned to nothingness; even the heaven and earth and all things that He created, including all humanity, would have returned to nothingness and been trampled upon by Satan. And so Jehovah’s wish that ‘He should have a place to stand on earth, a holy place among His creation’ would have been shattered. So instead, after God created mankind, He guided them in their lives, and spoke to them, all in order to realize His desire, to achieve His plan. God’s work in Israel was meant only to execute the plan He had set in place before His creation of all things, and therefore His working first among the Israelites and His creation of all things were not at odds with each other, but were both for the sake of His management, His work, and His glory, deepening the meaning of His creation of mankind. He guided the life of mankind on earth for two thousand years after Noah, during which He taught them how to revere Jehovah the Lord of all things, taught them how to conduct themselves and live their lives, and most of all, how to act as a witness for Jehovah, obey Him, and revere Him, and to praise Him with music like David and his priests.
Before the two thousand years during which Jehovah did His work, man knew nothing, and almost all degenerated to the depth of promiscuity and corruption that preceded the flood; their hearts were devoid of Jehovah, let alone His way. They never understood the work Jehovah was going to do; they lacked reason, much less knowledge, like living, breathing machines, ignorant of man, God, the world, and life alike. On earth they engaged in much seduction, like the serpent, and said many things that were offensive to Jehovah, but because they were ignorant Jehovah did not chastise or discipline them. After the flood, when Noah was 601 years old, Jehovah formally appeared to Noah and guided him and his family, leading him, the birds, and the beasts that survived the flood, and his descendants until the end of the Age of Law, a total of 2,500 years. He was formally at work in Israel for 2,000 years, and the period for which He was at work both in Israel and outside of it was 500 years, which together makes 2,500 years.”
from “The Work in the Age of Law” in The Word Appears in the Flesh
“In the Age of Grace man had been corrupted by Satan, and so the work of redeeming all humanity required an abundance of grace, infinite forbearance and patience, and even more, an offering adequate to atone for humanity’s sins. What people saw in the Age of Grace was merely My sin offering for humanity, Jesus. And they knew only that God could be merciful and forbearing, saw only Jesus’ mercy and lovingkindness. This was because they lived in the Age of Grace. So before they could be redeemed, they had to enjoy much grace that Jesus bestowed on them; only this was beneficial to them. This way, they could be forgiven of their sins through their enjoyment of grace, and could have the chance to be redeemed through enjoying Jesus’ forbearance and patience. Only through Jesus’ forbearance and patience were they capable of receiving forgiveness and enjoying the abundance of grace bestowed by Jesus—just as Jesus said, ‘I have come not to redeem the righteous but sinners, allowing their sins to be forgiven.’ If Jesus had been incarnated with the disposition of judgment, curse, and intolerance of man’s offenses, then man would never have had the chance to be redeemed, and would have remained forever sinful; and so the six-thousand-year management plan would have progressed no farther than the Age of Law. The Age of Law would have gone on for six thousand years, man’s sins would have grown greater in number and more grievous, and the creation of humanity would have been for naught. Men would only have been able to serve Jehovah under the law, but their sins would have exceeded those of the first created humans. The more Jesus loved mankind, forgiving them of their sins and giving them enough mercy and lovingkindness, the more mankind was capable of being saved, called the lost lambs that Jesus bought back at a great price. Satan could not meddle in this work, because Jesus treated His followers as a loving mother treats the infant in her arms. He did not grow angry at them or despise them, but was full of consolation; He never got furious among them, but forbore with their sins and turned a blind eye to their foolishness and ignorance, such that He said, ‘Forgive others seventy times seven times.’ So His heart reformed the hearts of others, and in this way did the people receive forgiveness through His forbearance.”
from “The Truth Concerning the Work in the Age of Redemption” in The Word Appears in the Flesh
“This stage is done to reveal the iniquities within man through chastisement, judgment, the smiting of words, as well as the discipline and revelation of words, so that they may afterward be saved. This is work more in-depth than redemption. In the Age of Grace, man enjoyed enough grace and has already experienced this grace, and so it is no longer to be enjoyed by man. Such work is now out-of-date and is no longer to be done. Now, man is saved through judgment by the word. After man is judged, chastised and refined, his disposition is thereby changed. Is this not because of the words I have spoken? Each stage of work is done in line with the progress of all mankind and with the age. All work has its significance; it is done for the final salvation, for mankind to have a good destination in the future, and for man to be divided according to their kind in the end.
The work in the last days is to speak words. Great changes can be effected in man through the words. The changes now effected in these people on acceptance of these words are much greater than that of people in the Age of Grace on acceptance of those signs and wonders. For, in the Age of Grace, the demons went away from man with the laying on of hands and prayer, but the corrupt dispositions within man still remained. Man was healed of his sickness and forgiven his sins, but the work for just how the corrupt satanic dispositions within man could be cast away was not done in him. Man was only saved and forgiven his sins for his faith, but the sinful nature of man was not taken away and still remained within him. The sins of man were forgiven through God incarnate, but it does not mean that man has no sin within him. The sins of man could be forgiven through the sin offering, but man has been unable to resolve the issue of just how he can no longer sin and how his sinful nature can be cast away completely and be transformed. The sins of man were forgiven because of the work of God’s crucifixion, but man continued to live in the old, corrupt satanic disposition. As such, man must be completely saved from the corrupt satanic disposition so that the sinful nature of man is completely cast away and never again develops, thus allowing the disposition of man to be changed. This requires man to understand the path of growth in life, the way of life, and the way to change his disposition. It also needs man to act in accordance with this path so that the disposition of man can gradually be changed and he can live under the shining of the light, and that he can do all things in accord with the will of God, cast away the corrupt satanic disposition, and break free from Satan’s influence of darkness, thereby emerging fully from sin. Only then will man receive complete salvation. When Jesus was doing His work, man’s knowledge of Him was still vague and unclear. Man always believed that He was the son of David and proclaimed Him to be a great prophet and the benevolent Lord who redeemed man’s sins. Some, based on faith, became healed just by touching the edge of His garment; the blind could see and even the dead could be restored to life. However, man could not discover the corrupt satanic disposition deeply rooted within him and neither did man know how to cast it away. Man received much grace, such as the peace and happiness of the flesh, the blessing of the entire family upon the faith of one, and the healing of sicknesses, and so on. The rest were the good deeds of man and their godly appearance; if man could live based on such, he was considered a good believer. Only such believers could enter heaven after death, which means that they were saved. But, in their lifetime, they did not understand at all the way of life. They merely committed sins, then made confession in a constant cycle without any path toward a changed disposition; such was the condition of man in the Age of Grace. Has man received complete salvation? No! Therefore, after that stage was complete, there is still the work of judgment and chastisement. This stage makes man pure through the word so as to give man a path to follow. This stage would not be fruitful or meaningful if it continued with the casting out of demons, for the sinful nature of man would not be cast away and man would only stop upon the forgiveness of sins. Through the sin offering, man has been forgiven his sins, for the work of the crucifixion has already come to an end and God has prevailed over Satan. But the corrupt disposition of man still remains within them and man can still sin and resist God; God has not gained mankind. That is why in this stage of work God uses the word to reveal the corrupt disposition of man and asks man to practice in accordance with the right path. This stage is more meaningful than the previous one and more fruitful as well, for now it is the word that directly supplies life for man and enables the disposition of man to be completely renewed; it is a stage of work more thorough. Therefore, the incarnation in the last days has completed the significance of God’s incarnation and completely finished God’s management plan for the salvation of man.”
from “The Mystery of the Incarnation (4)” in The Word Appears in the Flesh
“In the work of man’s salvation, three stages have been carried out, which is to say that the battle with Satan has been split into three stages prior to the complete defeat of Satan. Yet the inner truth of the entire work of the battle with Satan is that its effects are achieved through bestowing grace upon man, and becoming a sin offering of man, forgiving the sins of man, conquering man, and making man perfect. As a matter of fact, the battle with Satan is not the taking up of arms against Satan, but the salvation of man, the working of the life of man, and the changing of man’s disposition so that he may bear testimony to God. This is how Satan is defeated. Satan is defeated through changing the corrupt disposition of man. When Satan has been defeated, that is, when man has been completely saved, then the ashamed Satan will be completely bound, and in this way, man will have been completely saved. And so, the substance of man’s salvation is the battle with Satan, and the war with Satan is primarily reflected in the salvation of man. The stage of the last days, in which man is to be conquered, is the last stage in the battle with Satan, and also the work of man’s complete salvation from the domain of Satan. The inner meaning of man’s conquest is the return of the embodiment of Satan, man who has been corrupted by Satan, to the Creator following his conquest, through which he will forsake Satan and completely return to God. In this way, man will have been completely saved. And so, the work of conquest is the last work in the battle against Satan, and the final stage in God’s management for the sake of Satan’s defeat. Without this work, the full salvation of man would ultimately be impossible, the utter defeat of Satan would also be impossible, and mankind would never be able to enter the wonderful destination, or get free from Satan’s influence. Consequently, the work of salvation of man cannot be concluded before the battle with Satan is concluded, for the core of the work of God’s management is for the sake of mankind’s salvation. Earliest mankind was in the hands of God, but because of Satan’s temptation and corruption, man was bound up by Satan and fell in the hands of the evil one. Thus, Satan became the object to be defeated in the work of God’s management. Because Satan took possession of man, and because man is the stock of all God’s management, if man is to be saved, then he must be snatched back from the hands of Satan, which is to say that man must be taken back after having been held captive by Satan. Satan is defeated through changes in man’s old disposition that restore his original sense, and in this way, man, who has been taken captive, can be snatched back from the hands of Satan. If man is freed from the influence and bondage of Satan, Satan will be shamed, man will ultimately be taken back, and Satan will be defeated. And because man has been freed from the dark influence of Satan, man will become the spoils of all of this battle, and Satan will become the object that will be punished once this battle has finished, after which the entire work of mankind’s salvation will have been completed.”
from “Restoring the Normal Life of Man and Taking Him to a Wonderful Destination” in The Word Appears in the Flesh
The source of this article How do God’s three stages of work deepen stage by stage and cause man to be saved?