The Gospel of Jesus Christ is not to stop with us; it is to spread with us. We are Plan A, there is no Plan B.
If we know Jesus, we are obligated to tell the world; and not just the world in our own backyard. THE world.
In Romans 1:14-15, Paul writes: I am under obligation both to Greeks and to barbarians, both to the wise and to the foolish. So I am eager to preach the Gospel to you also who are in Rome.
So there it is – in black and white – right from the Word of God. We are obligated to evangelize in our own city and country, and also go out into all the world to cultures and places that are foreign to us. This is not an easy task, which is why many people do not want to engage in missions.