The "gospel of the kingdom" is to preached. It is to penetrate throughout "the whole world as a testimony to all nations." There is no end of times until this is done.
We must go far and wide with the "gospel of the kingdom." It cannot remain contained behind the stained glass of our sanctuaries. It cannot simply rest in our hearts. It must come forth through our active engagement of sharing it with others.
"We may well be ashamed of our own personal imperfections, but we have no need to be ashamed of our doctrine." - J.C. Ryle