We can never send out a sufficient number of foreign workers to occupy every village, town and city throughout the world. But we can, with a few missionaries, train enough indigenous workers to evangelize every nation (ethnos or people group). That was the policy of Jesus. He trained the twelve, then the seventy, and sent them forth. Let us follow His example. Let every one of our missionaries choose and train his twelve and his seventy.
The Challenge of Missions, Oswald J. Smith, page 133