" This was Andrew Murray’s judgment a hundred years ago: As we seek to find out why, with such millions of Christians, the real army of God that is fighting the hosts of darkness is so small, the only answer is—lack of heart. The enthusiasm of the kingdom is missing. And that is because there is so little enthusiasm for the King.18 "

― John Piper , Let the Nations Be Glad!: The Supremacy of God in Missions