In, God has become flesh to work to save man. But because we don't understand of the incarnation, we regard God as the same as an ordinary person, we cannot recognize God's voice and we know even less how to welcome —to the point where we are even able to follow the religious world and ruling powers to defy and condemn God—the situation becomes no different from when God incarnated as the Lord to do His work of the Age of Grace. It appears, therefore, that understanding the truth of the incarnation is key to our knowing God. So what exactly is the incarnation? What is the essence of the incarnation?