Knowledge is indispensable to Christian life and service. If we do not use the mind that God has given us, we condemn ourselves to spiritual superficiality and cut ourselves off from many of the riches of God’s grace.
John StottThe nations are not gathered in automatically. If God has promised to bless "all the families of the earth," he has promised to do so "through Abraham's seed" (Genesis 12:3, 22:18). Now we are Abraham's seed by faith, and the earth's families will be blessed only if we go to them with the gospel. That is God's plain purpose.
John Stott