In what Apostle Wilford Woodruff describes as "the greatest sermon that ever was delivered to the Latter Day Saints since they have been a people," Brigham Young announces from the pulpit: "I believe [sic] in Sisters marrying brothers, and brothers having their sisters for Wives. Why? because we cannot do otherwise. There are none others for me to marry but my sisters . . . .Our spirits are all brothers and sisters, and so are our bodies; and the opposite idea has resulted from the ignorant and foolish traditions of the nations of the earth." Young's secretary George D. Watt has already married his own half sister as a plural wife. Her letter to Young shows that he was initially "unfavorable" toward allowing them to marry, but this sermon reveals theological basis for Young's authorizing Watt's brother-sister marriage and the three children born of their union.
[On This Day in Mormon History, http://onthisdayinmormonhistory.blogspot.com]