The Gospel of the Kingdom:
T. Austin Sparks
Chapter 5 - The Proclamation of the Kingdom
"And this gospel of the kingdom shall be preached in the whole world for a testimony unto all the nations; and then shall the end come" (Matthew 24:14).
Let us first analyse this verse, noticing its particular words.
"This Gospel [literally, 'good news'] of the Kingdom [literally, 'the royal reign'] shall be preached [this particular word means 'proclaimed', 'announced', 'heralded'] in the whole world [=the whole inhabited or habitable earth] for a testimony [=for a witness: Dr. Weymouth in his version translates that phrase - 'to set the evidence'].
Now with that analysis, let us build it all up into its full literal statement:
'This good news of the royal reign shall be heralded in the whole inhabited earth, to set the evidence before all the nations; and then shall the end come.'
That is a remarkable verse, for it comprehends nothing less than the whole mission, work, meaning and purpose of the person, incarnation, life, death, resurrection and exaltation of Jesus Christ, and it carries that through as the very meaning and business of His Church. It is a very comprehensive verse indeed.
But we must get behind this tremendous statement, try to get inside it. It is then to be noticed that what is called the Gospel, the good news - everything that Christianity has to say and to give - is defined in terms of a Kingdom, a sovereign rule, the outworking of a Kingship. Of course, we are so familiar with the language and with the idea that perhaps we have never really stopped to think what that means. Why is Christianity not spoken of as something else - 'this gospel of the communal state', 'this gospel of the social state', or some other designation? It is called 'the gospel of the sovereign rule, the royal reign'; in other words, the gospel of the Kingship of Jesus Christ. It is that, and nothing less an nothing other than that.
https://www.austin-sparks.net/english/books/gospel_of_the_kingdom_the.html
