The work of the servants of God is the calling of God to every member in the church, bringing the body of Christ into the unity of the faith for the work of the ministry. These will be preaching the Gospel of the kingdom of God into all the world for a witness to all nations, then the end will come.
Where we as the body of Christ are presently in the times and seasons of God. Also, what God is preparing for those who have an ear to hear what the Spirit is saying to the churches.
The sealing of God is the engravings of an engraver which is as a signet which is progressive, going from glory to glory to the full measure of the stature of the fullness of Christ, to a perfect man. God is coming back for a glorious church without spot of blemish. The church began in glory and is going back with JESUS in a greater glory.