The truth Almighty God expresses is indeed much higher than that of the Age of Grace. How can you prove that the work in the last days and the work in the Age of Grace are done by one God?

The answer from God’s word:

“After the work of Jehovah, Jesus became flesh to do His work amongst man. His work was not carried out in isolation, but built upon the work of Jehovah. It was work for a new age after God had concluded the Age of Law. Similarly, after the work of Jesus ended, God still continued His work for the next age, because the entire management of God is always progressing forward. When the old age passes, it will be replaced by a new age, and once the old work has been completed, a new work will continue the management of God. This incarnation is God’s second incarnation following the completion of Jesus’ work. Of course, this incarnation does not occur independently, but is the third stage of work after the Age of Law and the Age of Grace. Each new stage of God’s work always brings a new beginning and a new age. So too are there corresponding changes in the disposition of God, in His way of working, in the location of His work, and in His name. No wonder, then, that it is difficult for man to accept the work of God in the new age. But regardless of how He is opposed by man, God is always doing His work, and is always leading the whole of mankind forward. When Jesus came into the world of man, He brought the Age of Grace and ended the Age of Law. During the last days, God once more became flesh, and when He became flesh this time, He ended the Age of Grace and brought the Age of Kingdom. All those who accept the second incarnation of God will be led into the Age of Kingdom, and be able to personally accept the guidance of God. Though Jesus did much work among man, He only completed the redemption of all mankind and became man’s sin offering, and did not rid man of all his corrupt disposition. Fully saving man from the influence of Satan not only required Jesus to take on the sins of man as the sin offering, but also required God to do greater work to completely rid man of his disposition, which has been corrupted by Satan. And so, after man was forgiven his sins, God has returned to flesh to lead man into the new age, and begun the work of chastisement and judgment, and this work has brought man into a higher realm. All those who submit under His dominion shall enjoy higher truth and receive greater blessings. They shall truly live in the light, and shall gain the truth, the way, and the life.”

from Preface to The Word Appears in the Flesh