Boyd K. Packer, “The Mantle is Far, Far Greater Than the Intellect”, 1981, BYU Studies, Vol. 21, No. 3, pp. 259-271; “Church history can be so interesting and so inspiring as to be a very powerful tool indeed for building faith. If not properly written or properly taught, it may be a faith destroyer…There is a temptation for the writer or the teacher of Church history to want to tell everything, whether it is worthy or faith promoting or not…Some things that are true are not very useful…Teaching some things that are true, prematurely or at the wrong time, can invite sorry and heartbreak instead of the joy intended to accompany learning.”
Jesus said; “For my yoke is easy, and my burden is light.” in Matthew 11:30 and in John 8:31-32 the Bible states; “Then said Jesus to those Jews which believed on him, If ye continue in my word, then are ye my disciples indeed; 32 And ye shall know the truth, and the truth shall make you free.”
The only thing that isn’t useful to the Mormon Church is truth.