The final message will be
The Righteousness of Christ which is the very essence of the three angels' message.
Present truth is THAT MESSAGE
It is that message which needs to be understood.
When it is fully understood there will be a revival.
It is only when that message becomes not only a message but the motive and meaning of our lives, that the latter rain will come.
Funny you should bring that up, as I was going to start a thread on that as we came across that on our Wednesday night meeting, and there was some 'lively' discussion as to what constitutes the 3rd Angels message...
The Heart of God’s Last Message
"Several have written to me, inquiring if the message of justification by faith is the third angel’s message, and I have answered, “It is the third angel’s message in verity.”—Selected Messages 1:372 (1890). LDE 199.4
The Lord in His great mercy sent a most precious message to His people through Elders [E.J.] Waggoner and [A. T.] Jones. This message was to bring more prominently before the world the uplifted Saviour, the sacrifice for the sins of the whole world. It presented justification through faith in the Surety; it invited the people to receive the righteousness of Christ, which is made manifest in obedience to all the commandments of God. LDE 200.1
Many had lost sight of Jesus. They needed to have their eyes directed to His divine person, His merits, and His changeless love for the human family. All power is given into His hands, that He may dispense rich gifts unto men, imparting the priceless gift of His own righteousness to the helpless human agent. This is the message that God commanded to be given to the world. It is the third angel’s message, which is to be proclaimed with a loud voice, and attended with the outpouring of His Spirit in a large measure.—Testimonies to Ministers and Gospel Workers, 91, 92 (1895). LDE 200.2
The message of Christ’s righteousness is to sound from one end of the earth to the other to prepare the way of the Lord. This is the glory of God, which closes the work of the third angel.—Testimonies for the Church 6:19 (1900). LDE 200.3