"It was the design of the councils of heaven before the world was, that the principles and laws of the priesthood should be predicated upon the gathering of the people in every age of the world. Jesus did everything to gather the people, and they would not be gathered, and He therefore poured out curses upon them. Ordinances instituted in the heavens before the foundation of the world, in the priesthood, for the salvation of men, are not to be altered or changed. All must be saved on the same principles."
-Joseph Smith, TPJS pg. 308