P.M. went to the Grove and heard President Joseph preach on the law of the priesthood. He stated that Hyrum held the office of prophet to the church by birthright and he was going to have a reformation and the saints must regard Hyrum for he has authority. He showed that a man must enter into an everlasting covenant with his wife in this world or he will have no claim on her in the next. He said that he could not reveal the fulness of these things untill the Temple is completed &c.
[Source: George D. Smith, An Intimate Chronicle; The Journals of William Clayton, Signature Books in association with Smith Research Associates, Salt Lake City, 1995, http://bit.ly/WilliamClayton]