D&C 47

Having been called to keep a history of the Church, John Whitmer is told - 

"Wherefore, it shall be given him, inasmuch as he is faithful, by the Comforter, to write these things..."  (Doctrine and Covenants 47:4)

In my mind, it becomes clear that in any calling we receive, we are to be faithful in doing so relying of the Spirit of the Lord.