The initial work of the three stages of God’s work was done directly by the Spirit, and not by the flesh. The final work of the three stages of God’s work, however, is done by the incarnate God, and not directly by the Spirit. The work of redemption of the intermediary stage was also done by God in the flesh. Throughout the entire management work, the most important work is man’s salvation from the influence of Satan. The key work is the complete conquest of corrupt man, thus restoring the original reverence of God in the heart of conquered man, and allowing him to achieve a normal life, which is to say, the normal life of a creature of 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.