"Well," said he [Heber C. Kimball], "there are many things revealed in these last days that the world would laugh and scoff at; but unto us is given to know the mysteries of the kingdom. ...
A little later, Brigham Young proposed to her saying:
Brother Josaph [Joseph] has has [sic; had] a revelation from God that it is lawful and right for a man to have two wives; for as it was in the days of Abraham, so it shall be in these last days ... if you will accept of me, I will take you straight to the celestial kingdom; and if you will have me in this world, I will have you in that which is to come... "
Ten minutes later, Joseph came into the room and told her:
"Yes," said Joseph, "and I know that this is lawful and right before God, and if there is any sin in it I will answer for it before God, and I have the keys of the kingdom, and whatever I bind on earth is bound in heaven, and whatever I loose on earth is loosed in heaven; and if you will accept of Brigham, you shall be blessed... it would be the greatest blessing that was ever bestowed upon you...."
Brigham Young added:
and you will never have reason to repent it -- that is, if I do not turn from righteousness, and that i trust I never shall ...
As she concluded her account, she noted:
"The next day being Sunday, I sat down, instead of going to meeting, and wrote the conversation, and gave it to my sister ... "
[Source: John C. Bennett's fourth letter (written Jul 15) to the Sangamo Journal containing the Martha Brotherton affidavit]