In the Bible it says, “this same Jesus … shall so come in like manner as you have seen him go into heaven.” When the Lord returns, it shall be with Him riding on a white cloud, why would He become flesh?

The Answer from God’s Word:

Since Jesus departed, the disciples who followed Him, and all of the saints who were saved thanks to His name, have been desperately pining for Him and awaiting Him. All those who were saved by the grace of Jesus Christ during the Age of Grace have been longing for that joyful day during the last days, when Jesus the Savior arrives on a white cloud and appears among man. Of course, this is also the collective wish of all those who accept the name of Jesus the Savior today. Throughout the universe, all those who know of the salvation of Jesus the Savior have been desperately yearning for the sudden arrival of Jesus Christ, to fulfill the words of Jesus when on earth: “I shall arrive just as I departed.” Man believes that, following the crucifixion and resurrection, Jesus went back to heaven upon a white cloud, and took His place at the Most High’s right hand. Similarly, man conceives that Jesus shall descend, again upon a white cloud (this cloud refers to the cloud that Jesus rode upon when He returned to heaven), among those who have desperately yearned for Him for thousands of years, and that He shall bear the image and clothes of the Jews.    
After appearing to man, He shall bestow food upon them, and cause living water to gush forth for them, and shall live among man, full of grace and love, living and real. And so on. Yet Jesus the Savior did not do this; He did the opposite of what man conceived. He did not arrive among those who had yearned for His return, and did not appear to all men while riding upon the white cloud. He has already arrived, but man does not know Him, and remains ignorant of His arrival. Man is only aimlessly awaiting Him, unaware that He has already descended upon a white cloud (the cloud which is His Spirit, His words, and His entire disposition and all that He is), and is now among a group of overcomers that He will make during the last days.

from “The Savior Has Already Returned Upon a ‘White Cloud’” in The Word Appears in the Flesh

History is always moving forward, and the work of God is always moving forward. For His six-thousand-year management plan to reach its end, it must keep progressing in a forward direction. Each day He must do new work, each year He must do new work; He must open up new paths, must launch new eras, begin new and greater work, and along with these, bring new names and new work. From moment to moment, the Spirit of God is doing new work, never clinging to old ways and regulations. Nor has His work ever stopped, but is coming to pass with each passing moment. If you say that the work of the Holy Spirit is immutable, then why did Jehovah ask the priests to serve Him in the temple, yet Jesus did not enter the temple—even though, when He came, people also said that He was the high priest, and that He was of the house of David and also the high priest and the great King? And why did He not offer sacrifices? Entering the temple or not entering the temple—is all this not the work of God Himself? If, as man imagines, Jesus will come again and, in the last days, still be called Jesus, and still come on a white cloud, descending among men in the image of Jesus: wouldn’t that be a repetition of His work? Is the Holy Spirit capable of clinging to the old? All that man believes are conceptions, and all that man understands is according to their literal meaning, and also according to his imagination; they are out of line with the principles of the work of the Holy Spirit, and do not conform to the intentions of God. God would not work in that way; God is not so foolish and stupid, and His work is not so simple as you imagine. Based on everything that man does and thinks, Jesus will come riding on a cloud and descend in your midst. You shall behold Him, and He, riding a cloud, shall tell you He is Jesus. You shall also behold the nail marks in His hands, and shall know Him to be Jesus. And He shall save you again, and shall be your mighty God. He shall save you, bestow upon you a new name, and give each of you a white stone, after which you shall be allowed to enter the kingdom of heaven and be received into paradise. Are such beliefs not the conceptions of man? … There are those who say that God Himself said that He would arrive on a cloud. It is true that God said so Himself, but don’t you know that no man can fathom the mysteries of God? Don’t you know that no man can explain the words of God? Are you certain, beyond the shadow of a doubt, that you were enlightened and illuminated by the Holy Spirit? Surely it was not that the Holy Spirit showed you in such a direct manner? Was it the Holy Spirit who instructed, or did your own conceptions lead you to think so? You said, “This was said by God Himself.” But we cannot use our own conceptions and minds to measure the words of God. As for the words spoken by Isaiah, can you with absolute certainty explain his words? Do you dare to explain his words? Since you do not dare to explain the words of Isaiah, why do you dare to explain the words of Jesus? Who is more exalted, Jesus or Isaiah? Since the answer is Jesus, why do you explain the words spoken by Jesus? Would God tell you of His work in advance? Not a single creature can know, not even the messengers in heaven, nor the Son of man, so how could you know?

from “The Vision of God’s Work (3)” in The Word Appears in the Flesh

Do you wish to know the root of why the Pharisees opposed Jesus? Do you wish to know the substance of the Pharisees? They were full of fantasies about the Messiah. What’s more, they believed only that the Messiah would come, yet did not seek the truth of life. And so, even today they still await the Messiah, for they have no knowledge of the way of life, and do not know what the way of truth is. How, say you, could such foolish, stubborn and ignorant people gain God’s blessing? How could they behold the Messiah? They opposed Jesus because they did not know the direction of the Holy Spirit’s work, because they did not know the way of truth spoken by Jesus, and, furthermore, because they did not understand the Messiah. And since they had never seen the Messiah, and had never been in the company of the Messiah, they made the mistake of paying empty tribute to the name of the Messiah while opposing the substance of the Messiah by any means. These Pharisees in substance were stubborn, arrogant, and did not obey the truth. The principle of their belief in God is: No matter how profound Your preaching, no matter how high Your authority, You are not Christ unless You are called the Messiah. Are these views not preposterous and ridiculous? I ask you again: Is it not extremely easy for you to commit the mistakes of the earliest Pharisees, given that you have not the slightest understanding of Jesus? Are you able to discern the way of truth? Can you truly guarantee that you will not oppose Christ? Are you able to follow the work of the Holy Spirit? If you do not know whether you will oppose Christ, then I say that you are already living on the brink of death. Those who did not know the Messiah were all capable of opposing Jesus, of rejecting Jesus, of slandering Him. People who do not understand Jesus are all capable of denying Him, and reviling Him. Moreover, they are capable of seeing the return of Jesus as the deceit of Satan, and more people shall condemn Jesus returned to flesh. Does not all of this make you afraid? What you face shall be blasphemy against the Holy Spirit, the ruination of the words of the Holy Spirit to the churches, and the spurning of all that is expressed by Jesus. What can you gain from Jesus if you are so befuddled? How can you understand the work of Jesus when He returns to flesh on a white cloud, if you obstinately refuse to realize your errors? I tell you this: People who do not accept the truth, yet blindly await the arrival of Jesus upon white clouds, will surely blaspheme against the Holy Spirit, and they are the race that shall be destroyed. You merely wish for the grace of Jesus, and merely want to enjoy the blissful realm of heaven, yet you have never obeyed the words spoken by Jesus, and have never received the truth expressed by Jesus when He returns to flesh. What will you hold up in exchange for the fact of Jesus’ return upon a white cloud? Is it the sincerity in which you repeatedly commit sins, and then confess them, over and over? What will you offer in sacrifice to Jesus who returns upon a white cloud? Is it the years of work with which you exalt yourselves? What will you hold up to make the returned Jesus trust you? Is it that arrogant nature of yours, which does not obey any truth?

… Many people may not care what I say, but I still want to tell every so-called saint who follows Jesus that, when you see Jesus descend from the heaven upon a white cloud with your own eyes, this will be the public appearance of the Sun of righteousness. Perhaps that will be a time of great excitement for you, yet you should know that the time when you witness Jesus descend from the heaven is also the time when you go down to hell to be punished. It will herald the end of God’s management plan, and will be when God rewards the good and punishes the wicked. For the judgment of God will have ended before man sees signs, when there is only the expression of truth. Those who accept the truth and do not seek signs, and thus have been purified, shall have returned before the throne of God and entered the Creator’s embrace. Only those who persist in the belief that “The Jesus who does not ride upon a white cloud is a false Christ” shall be subjected to everlasting punishment, for they only believe in the Jesus who exhibits signs, but do not acknowledge the Jesus who proclaims severe judgment and releases the true way of life. And so it can only be that Jesus deals with them when He openly returns upon a white cloud.

from “When You Behold the Spiritual Body of Jesus Will Be When God Has Made Anew Heaven and Earth” in The Word Appears in the Flesh