Moroni wrote his account of the vision of the brother of Jared on the plates of Mormon, but he was commanded by the Lord to "seal up" this account. (Ether 4:4-5.) Joseph Smith was commanded not to translate this sealed portion. It is not absolutely clear what portion of the plates of Mormon was sealed. Joseph Smith simply said: "The volume was something near six inches in thickness, a part of which was sealed." (History of the Church, 4:537.) George Q. Cannon said that "about one-third" was sealed (Young Peoples' History of Joseph Smith, p. 25), whereas Orson Pratt maintained that the sealed portion comprised "about two-thirds" of the plates. (Journal of Discourses, 3:347.) Neither of these two brethren indicate where they obtained their information.