In a discourse given in Filmore, Utah on September 7, 1864 which is available here, Brigham Young taught:
"I say to you, as I can to the whole world, there has not yet been a
revelation given to this people from the time Joseph commenced to
receive revelation but what would be [altered] provided the people were
capable of receiving more. The Lord has to speak to the people according
to their capacity, not according to his capacity. We are not prepared
to receive all the heavens has for us. The Lord gives revelation upon
revelation, here a little and there a little. Those precepts he gives we
should improve upon them. . . . The Lord is laboring and has been for
long time to prepare a people to receive blessings. He sent his gospel,
called Joseph, gave the Book of Mormon, to prepare us to . . . receive
all the blessings the earth can bestow, and the blessings of eternity.
You and I believe alike with regard to the fullness of his power and
goodness. He has blessings and wants bestow them on the whole human
family. We believe alike. Why are we not blessed then? We are not ready
to receive the blessings."