When the heavens opened to Joseph and Sidney Rigdon jointly in 1832, they saw and heard many things. Among the many things shown them was the Father sitting on His Throne and the Son beside Him. (D&C 76: 23.) The Vision included not just the final state of mankind in the various kingdoms of glory, but also included an explanation of the rebellion by an angel in a position of authority before God. (D&C 76: 25.) They saw the heavens weep over this rebellious angel. (D&C 76: 26.) They saw the terrible, inexpressible end to him, and all who follow him. (D&C 76: 44-48.)

They saw the final state of mankind. They also beheld many things they were not permitted to write. (D&C 76: 114-115.) Their knowledge exceeded what is lawful for man to know. Because of this knowledge, they were not like the others of their generation.

They entered into the Throne Room of the Father, and beheld Him in His glory. Because of this, both Joseph and Sidney “received of his fulness” (D&C 76: 20). This is how the fullness is received. It can be symbolized, ritualized, or conferred by an ordinance, but the fullness itself involves God the Father and His Son Jesus Christ, personally. Therefore, when we speak of “fullness” through symbol, ordinance and ritual, we are speaking of the type. When we speak of the “fullness” itself, we are speaking of the real thing. There is a custom to accept the rites and symbols in place of the real thing. This is so much so that, today, some doubt the need for the real thing.

The “fullness of the Father” includes the “fullness of the priesthood.” It also includes more. Joseph and Sidney joined the holy angels who stood before God. (D&C 76: 21.) Therefore, they would be among those who “came to an innumerable company of angels, to the general assembly and church of Enoch, and of the Firstborn.” (D&C 76: 67.)

By 1841 the fullness of the priesthood had been forfeited by the church. (D&C 124: 28.) Christ offered, on condition of the completion of the Nauvoo Temple, to come and restore that fullness again to the church. That required Him to come. (D&C 124: 28.) If He came, then men would be redeemed from the fall and return to God’s presence. (Ether 3: 13.)

To have Zion, God must come and dwell with His people. (Moses 7:  69.) To have Zion is to have people who:
-are of one heart, and
-are of one mind, and
-dwell in righteousness, and
-have no poor among them. (Moses 7: 18.)

There are many things which occupy the attention of Latter-day Saints. This short list, however, would seem to be the most important place to begin, assuming we were interested in having Zion return. We are not currently unified and for the most part are fragmenting. This is the inverse of what brings Zion.