"Mormonism" so-called, embraces every principle pertaining to life and salvation, for time and eternity.  No matter who has it.  If the infidel has got truth it belongs to "Mormonism."  The truth and sound doctrine possessed by the sectarian world, and they have a great deal, all belongs to this Church.  As for their morality, many of them are morally, just as good as we are.  All that is good, lovely, and praiseworthy belongs to this Church and Kingdom.  "Mormonism" includes all truth. There is no truth but what belongs to the Gospel.

-Brigham Young, Journal of Discourses (11-375)