Joseph knew right from the beginning of the restoration that the Lord was simply continuing His eternal work of redeeming families in this last dispensation. Thus, the very first "section" of the Doctrine and Covenants is Moroni's latter-day rendering of Malachi's promise that Elijah would return prior to the second coming.
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Indeed the Salt Lake Valley was at that time a desert, a solitary place. But since then it blossomed as the rose and became the center place where the ransomed of the Lord came to Zion with songs and everlasting joy upon their heads.
The Doctrine and Covenants is an invitation to all people everywhere to come unto Christ. In the revelations of this book “one hears the tender but firm voice of the Lord Jesus Christ,” inviting all to come unto Him “preparatory to his second coming.”