This is good, from Wm. Barclay on 3 John 8, but there’s more that needs to be said:
There is a great Christian thought here. A man’s circumstances may be such that he cannot become a missionary or a preacher. Life may have put him in a position where he must get on with a secular job, staying in the one place and carrying out the routine duties of life and living. But where he cannot go, his money and his prayers and his practical support can go. Not everyone can be, so to speak, in the front line; but by supporting those who are there, he can make himself an ally of the truth. When we remember that, all giving to the wider work of Christ and his church must become not an obligation but a privilege, not a duty but a delight. The church needs those who will go out with the truth, but it also needs those who will be allies of the truth at home.
What else to say? That each one, in his place, home, work, school, is also a Christian “adventurer,” light, influence, speaker for the Good News. It is good to support the proclamation of truth with our material means. It is also necessary that each of us be a goer, within the reach permitted to us.
Some people say that the “go” of the Great Commission does not apply to all, that each individual cannot go into all the world. This is being ingenious. All of us can, and must, go to some part of the world. The first Christians did, Acts 8.4, and so must we.
We may not be able to go across oceans to other continents, but we can go across the street to other homes.