I was specifically referring to the "Kingdom" message. WT has explained many aspects of the kingdom
I was thinking of this with regard to the Kingdom message, taken from the book "Babylon The Great Has Fallen!" God's Kingdom Rules! Chapter 21 Under the subheading Good News and a Judgement Message ( www.strictlygenteel.co.uk/babylon/babylon21.html)
The news of God's kingdom, even when it was yet coming, was gospel or good news. (Matthew 4:23; Mark 1:14, 15) The news that God's kingdom was already set up and put in operation in the heavens was still better news. First in 1920 did we discern that the good news of God's kingdom as established in the heavens in 1914 (A.D.) was to be preached in fulfillment of Matthew 24:14. This verse was the theme text of the article "Gospel of the Kingdom" that was published in The Watch Tower in English under date of July 1, 1920. In the last paragraph on page 199, the article quoted Jesus' prophecy in Matthew 24:14 and then went on to say:
It will be noted he does not say the gospel that has been preached to the meek throughout the entire Gospel age shall be preached. What gospel then could he mean? The gospel means good news. The good news here is concerning the end of the old order of things and the establishment of Messiah's kingdom. It means the dark night of sin and sorrow is passing away. It means that Satan's empire is falling, never to rise again. . . .
. . . Plainly this would seem to indicate that now the church must engagethe proclamation of this good news as a witness to the nations of earth, and then the old order will entirely pass away and the new will be here...
Shortly afterward, namely, on Friday, September 8, 1922, at an international assembly of unsectarian Bible students in Cedar Point, Ohio, in an address on "The Kingdom" at 9:30 a.m., it was said to them that they must be witnesses of the Lord God, that is, Jehovah's witnesses. The speaker, J. F. Rutherford, then president of the Watch Tower Bible & Tract Society, quoted to the assembled thousands Isaiah 43:8-12 (AV) and then proceeded to say:
Thus we see that those of the temple class are clearly designated as the Lord's witnesses at this time, to bring a message of consolation to the people, that the kingdom of heaven is here, and that millions now living will never die...