"Now it came to pass, when Jesus finished commanding His twelve disciples, that He departed from there to teach and to preach in their cities."
This verse (above) has some good principles in it. To start with, note that our Lord Jesus Christ *first* instructs, or "commands" His own disciples. Then, only *after* having done that, He (Jesus) went out into the cities to preach the gospel to the masses, as well.
That is the pattern that we see repeated over and over in the Gospel accounts; and throughout the rest of the Holy Book. God *always* starts at home, in Christ's church; and from there He branches out to the rest of the world. In reaching elect sinners in the world, Christ adds to His church, and expands the borders of His kingdom (on earth).
[Puritan quote of the day: "Those whom God loves, He loves unto the end." --William Bridge, in "A Lifting Up for the Downcast"]
