Doctrine & Covenants 3:4

For although a man may have many ^arevelations, and have^bpower to do many mighty works, yet if he ^cboasts in his own^dstrength, and sets at naught the ^ecounsels of God, and follows after the dictates of his own will and ^fcarnal desires, he must fall and incur the ^gvengeance of a ^hjust God upon him.

D & C 3:19-20 

And for this very ^apurpose are these ^bplates ^cpreserved, which contain these records—that the ^dpromises of the Lord might be fulfilled, which he made to his ^epeople;

 20 And that the ^aLamanites might come to the knowledge of their fathers, and that they might know the ^bpromises of the Lord, and that they may ^cbelieve the gospel and ^drely upon the merits of Jesus Christ, and be ^eglorified through faith in his name, and that through their repentance they might be saved. Amen.

I think that it is interesting that D &C 2 speaks of Elijah and turning the hearts of the children toward their fathers.  And then the Lord in D & C 3 states that a reason for the Book of Mormon is teach the descendents of the Nephites and Lamanites the promises made to their fathers, thus turning their hearts to their fathers.