Why do we believe in and practice polygamy? Because the Lord introduced it to his servants in a revelation given to Joseph Smith, and the Lord's servants have always practiced it. 'And is that religion popular in heaven?' It is the only popular religion there.
Brigham Young[Our] first and foremost duty [is] to seek the Lord until we open the path of communication from God to our own soul.
Brigham YoungI believe in sisters marrying brothers, and brothers having their sisters for wives... This is something pertaining to our marriage relation. The whole world will think what an awful thing it is. What an awful thing it would be if the Mormons should just say we believe in marrying brothers and sisters.
Brigham Young