The key to the missionary's work is the authority of Jesus Christ, not the needs of the lost. We are inclined to look on our Lord as one who assists us in our endeavors for God. Yet our Lord places Himself as the absolute sovereign and supreme Lord over His disciples. He does not say that the lost will never be saved if we don't go- He simply says, "Go therefore and make disciples of all the nations...."
Oswald Chambers (2010). “My Utmost for His Highest”, p.594, Discovery House