That the idea of the revelation (i. e., of the existence of the Book of Mormon) as described by Smith in his autobiography was not original is shown by the fact that a similar divine message, engraved on plates, was announced to have been received from an angel nearly six hundred years before the alleged visit of an angel to Smith. These original plates were described as a copper, and the recipient was a monk named Cyril, from whom their contents passed into the possession of the Abbot Joachim, whose "Everlasting Gospel," founded thereon, was offered to the church as supplanting the New Testament, just as the New Testament had supplanted the Old, and caused so serious a schism that Pope Alexander IV took the severest measures against it. [39] This description of the origin of Joachim's "Everlasting Gospel" rests upon the respectable authority of Draper, in his "Intellectual Development of Europe." [40] Linn's argument is to the effect that this origin of the "Everlasting Gospel" suggested the origin of the Book of Mormon because of the resemblance between the celestial announcement of both, and also because that both, according to his idea of them, were declared to have the same purport--each was to be "a forerunner of the end of the world." He also urges the frequent use of the phrase, "Everlasting Gospel," in the discourses of the early Elders of the Church as evidence that there was some connection between these two things, the Book of Mormon and "The Book of Joachim." He further holds that Sidney Rigdon, in the course of his ecclesiastical reading would come in contact with the story of Joachim's "Everlasting Gospel;" that it would be just such a story as would be attractive to one of Sidney Rigdon's temperament. Linn throughout his work assumes a connection and collaboration between Joseph Smith and Sidney Rigdon, and claims that the latter suggested the story of the "Book of Joachim," as the ground-work of Joseph Smith's account of the origin of the Book of Mormon. Our author thinks that Rigdon may even have found sufficient matter in relation to Joachim's "Everlasting Gospel," in Mosheim's "Ecclesiastical History," to suggest the account he induced Joseph Smith to give of the origin of the Book of Mormon, and makes the following quotation from Mosheim in proof of his contention: