Assume it has been written by the eight men that make up the 'slave' and that they are dictating the material to be written via their secretaries,
then it becomes,
QUOTE "It is vital that you appreciate this fact and respond to our directions as you would to the voice of God, because it is His provision." Watchtower 1957 Jun 15 p.370
QUOTE "The point is that you have implicit trust in your heavenly Father; you do not question what he tells you through his written Word and by listening to us." Watchtower 1974 Jul 15 p.441 **** and how do we learn what God tells us in his written word?