“However, in a broad general sense, caste systems have their root and origin in the gospel itself, and when they operate according to the divine decree, the resultant restrictions and segregation are right and proper and have the approval of the Lord. To illustrate: Cain, Ham, and the whole negro race have been cursed with a black skin, the mark of Cain, so they can be identified as a caste apart, a people with whom the other descendants of Adam should not intermarry.”

Bruce R. McConkie, Mormon Doctrine (Salt Lake City, UT: Bookcraft, Inc., 1966 edition), 83.