So, last Sunday morning Josh and I were in bed recovering from an ugly stomach bug, and decided to listen to several of Piper's sermons on the subject. If you haven't heard him preach on this you are missing a huge part of his heart...start with "Doing Missions When Dying is Gain"...you won't be the same!
Anyway, though he says SO MUCH there was one statement in particular that really challenged us. This is from his sermon called, "Missions: The Battle Cry of Christian Hedonism."
"When Jesus commissioned his church to disciple the peoples, he did not have in mind merely political boundaries. He had in mind the distant, distinct groups including tribes and tongues and peoples. And today there are over 16,000 such groups undiscipled. If every Christian in the world won all his neighbors to Christ, half the world would be unevangelized; because two billion people make up culturally distant people groups who do not have an indigenous witness. They are the "hidden peoples," the "frontier missions" of our day. The only way they can be reached is by cross-cultural missionaries."