Hello,
Here below is the answer :
These invisible ones the Lord uses to put in the hands of his "faithful servant" class, that is, the man clothed with linen, the fiery message from his Word, or judgments written, and which is to be used as directed. The resolutions adopted by conventions of God's anointed people, booklets, magazines, and books published by them, contain the message of God's truth and are from the Lord Jehovah, and provided by him through Christ Jesus and his underofficers.... The interpretation of prophecy, therefore, is not from man but is from Jehovah... (Vindication 1, 1931 p.120; w. 1.5.1938 p.143)
Surprised ? Agape J.C.MacHislopp