He will go out before God in the spirit and power of Elijah--to reconcile fathers and children, and bring back the disobedient to the wisdom of good men--and he will make a people fully ready for their Lord. Luke 1:17, Phillips.  {CC 271.1}  

     God had called the son of Zacharias to a great work, the greatest ever committed to men. . . . John was to go forth as Jehovah's messenger, to bring to men the light of God. He must give a new direction to their thoughts. He must impress them with the holiness of God's requirements, and their need of His perfect righteousness. Such a messenger must be holy. He must be a temple for the indwelling Spirit of God. In order to fulfill his mission, he must have a sound physical constitution, and mental and spiritual strength. Therefore it would be necess ...