Jesus is sitting on the mount of Olives with His disciples when Peter, James, John, and Andrew asked Him about when His second coming would occur. Jesus began to tell them some of the signs. One of which is:
"The gospel must first be published among all nations.
"But when they shall lead you, and deliver you up, take no thought beforehand what ye shall speak, neither do ye premeditate: but whatsoever shall be given you in that hour, that speak ye: for it is not ye that speak, but the Holy Ghost."
I have often pondered about how the gospel will be spread to the WHOLE earth before the Savior comes. Sometimes I imagine fireworks and a loud speaker from heaven. Or maybe a huge movie screen. But, ya know what? I don't think it will be like that. I think if may be what we are doing already -- sending out missionaries
One of "my" converts was Annica. She has such a beautiful testimony and knowledge of the truth. One day while we were at a picnic, me and my companion Sister Dietrich gave Annica little cards we had written on to stick in her first copy of the Book of Mormon. I said "your grandchildren will look at that look and read these cards and say 'wow! This was grandma's first Book of Mormon!'" Then Annica said "Wow! My grandkids are going to be Mormons! That is fantastic!"
Now that I am reading these verses in Mark, I imagine that this rapid spreading can mostly occur generationally. From Annica down to her grandchildren, hordes of people will know the gospel. Each convert and member is like a pebble thrown into a lake. We may think the pebble is small, but the ripples off the pebble continue outward far beyond its original size.