Husband and wife should be united. ("one flesh")
Christ and the Father are one.
Saints should be one even as Christ and the Father.
Brigham Young, "Building Up Zion, Etc.", Journal of Discourses, vol. 13, pp.152, 155
Unity required to build up Zion.
From the allegory of the olive tree:
"and they became like unto one body; and the fruits were equal"
J. Robert Nelson, "Burbank Blvd.: A Lesson in Unimortant Differences", Ensign, July 2007
The author shares a couple of experiences, one with disunity in a ward and one with unity. He shares that the differences which we allow to separate us from our neighbor are not generally important ones. We might similarly understand that these differences that ought not to divide us make the stock of the diversity which can be so healthy for us.
The church was organized "for the perfecting of the saints ... till we all come in the unity of the faith".
Pres. Gordon B. Hinckley, "An Unedning Conflict, a Victory Assured", Ensign, June 2007, subsection "The Pattern of Conflict"
We can not hope to win the battles against evil if we are not united.
As unifying the family is the first logical step beyond building personal worthiness in the quest to establish Zion, I thought this piece was particularly interesting.
Discusses the benefits of the "nosiness" that exists in close-knit ward families.
President Henry B. Eyring, "Be One", Ensign, September 2008, pp. 4-9
"[The Spirit] never generates the feelings of distinction between people which lead to strife."
Joseph Smith, compiled by Joseph Fielding Smith, "Teachings of the Prophet Joseph Smith", p. 32
Written by Joseph Smith in 1833 regarding the hardships faced by the Saints in Missouri: "I cannot account for [the afflictions of the righteous who must be afflicted along with the wicked], only on this wise, that the saying of the Savior has not been strictly observed: 'If thy right eye offend thee, pluck it out, and cast it from thee; or if thy right arm offend thee, cut it off, and cast it from thee.'"