I've googled and yahoo'd "polygamy" but I can't seem to find their reasoning for it. Does anyone here understand why they do it?
The things I've read say that the first husbands who practiced polygamy said :
For Mormons who practiced this years ago,they saw it as a continuation of OT practices with multiple wives...You need to look up Plural Marriages,as Mormon's called it...This practice IS not sanctioned by the LDS..
SOme info
Essential to Salvation
After a special conference held in 1852, the Mormon church leaders began to devote much of their time to the preaching of polygamy. During the period that the Mormon church was openly practicing polygamy, the leaders of the church were declaring that it was absolutely necessary and essential for exaltation. One woman testified as follows in the Temple Lot Case: "Yes, sir, President Woodruff, President Young, and President John Taylor, taught me and all the rest of the ladies here in Salt Lake that a man in order to be exalted in the Celestial Kingdom must have more than one wife, that having more than one wife was a means of exaltation" (Temple Lot Case, p.362).
Sixth president Joseph F. Smith spoke with clarity on the issue:
Some people have supposed that the doctrine of plural marriage was a sort of superfluity, or non-essential to the salvation of mankind. In other words, some of the Saints have said, and believe that a man with one wife, sealed to him by the authority of the Priesthood for time and eternity, will receive an exaltation as great and glorious, if he is faithful, as he possibly could with more than one. I want here to enter my protest against this idea, for I know it is false. . . . Therefore, whoever has imagined that he could obtain the fullness of the blessings pertaining to this celestial law, by complying with only a portion of its conditions, has deceived himself. He cannot do it. When that principle was revealed to the Prophet Joseph Smith . . . an angel of God, with a drawn sword, stood before him and commanded that he should enter into the practice of that principle, or he should be utterly destroyed. . . .
If then, this principle was of such great importance that the Prophet himself was threatened with destruction, and the best men in the Church with being excluded from the favor of the Almighty, if they did not enter into and establish the practice of it on earth, it is useless to tell me that there is no blessing attached to obedience to the law, or that a man with only one wife can obtain as great a reward, glory or kingdom as he can with more than one. . . .
I understand the law of celestial marriage to mean that every man in this Church, who has the ability to obey and practice it in righteousness and will not, shall be damned. I say I understand it to mean this and nothing less, and I testify in the name of Jesus that it does mean that (Journal of Discourses, vol. 20, pp.28-31).
In 1891 the president and apostles of the Mormon church made the following statement in a petition to the President of the United States:
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We, the first presidency and apostles of the Church of Jesus Christ of Latter-Day Saints, beg to respectfully represent to Your Excellency the following facts:
We formerly taught to our people that polygamy or Celestial Marriage as commanded by God through Joseph Smith was right; that it was a necessity to man's highest exaltation in the life to come.
That doctrine was publicly promulgated by our president, the late Brigham Young, forty years ago, and was steadily taught and impressed upon the Latter-Day Saints up to September, 1890 Reed Smoot Case, vol. 1, p.18).
In addition, the Latter-Day Saints' Millennial Star carried the following comments:
And we, . . . are believers in the principles of plural marriage or polygamy, . . . as a principle revealed by God, underlying our every hope of eternal salvation and happiness in heaven . . . we cannot view plural marriage in any other light than as a vital principle of our religion (Millennial Star, vol. 40, pp.226-27).
Upwards of forty years ago the Lord revealed to His Church the principle of celestial marriage. . . . the command of God was before them in language which no faithful soul dare disobey.
"For, behold, I reveal unto you a new and an everlasting covenant and if ye abide not that covenant, then are ye damned; for no one can reject this covenant, and be permitted to enter into my glory. . . ."
Damnation was the awful penalty affixed to a refusal to obey this law. It became an acknowledged doctrine of the Church; it was indissolubly interwoven in the minds of its members with their hopes of eternal salvation and exaltation in the presence of God. . . . Who could suppose that . . . Congress would enact a law which would present the alternative to religious believers of being consigned to a penitentiary if they should attempt to obey a law of God which would deliver them from damnation! (vol. 47, p.711).
William Clayton claimed that he learned from Joseph Smith that "the doctrine of plural and celestial marriage is the most holy and important doctrine ever revealed to man on the earth, and that without obedience to that principle no man can ever attain to the fulness of exaltation in the celestial glory" (Historical Record, vol. 6, p.226).
George Q. Cannon said that if he "had not obeyed that command of God, concerning plural marriage, I believe that I would have been damned" (Journal of Discourses, vol. 23, p.278).
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Click on above image to enlarge
A photograph of the Journal of Discourses, vol. 20, page 28. Joseph F. Smith, who became the sixth president of the church, stated that a man with one wife could not received as great an exaltaion as a man with more than one.
Brigham Young declared on August 19, 1866: "The only men who become Gods, even the Sons of God, are those who enter into polygamy" (Journal of Discourses, vol. 11, p.269).
At one time Joseph Smith told Heber C. Kimball that if he didn't enter into polygamy "he would lose his apostleship and be damned" (Life of Heber C. Kimball, p.336).
Kimball Young stated: "One man recalled a Stake conference in Southern Utah where the brethren were bluntly told to marry in polygamy or 'resign their church offices'" (Isn't One Wife Enough? p.108).
The Mormon writer John J. Stewart, writing in 1961, still upheld the teaching that plural marriage leads to exaltation: "Plural marriage is a pattern of marriage designed by God as part of His plan of eternal progress to further His kingdom and exalt His children" (Brigham Young and His Wives, p.71).
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