It is said that brother ...

It is said that brother Joseph in his lifetime declared that the Elders of this Church should step forth at a particular time when the Constitution should be in danger, and rescue it, and save it. This may be so; but I do not recollect that he said exactly so. I believe he [Joseph] said something like this - that the time would come when the Constitution and the country would be in danger of an overthrow; and said he, If the Constitution be saved at all, it will be by the Elders of this Church. I believe this is about the language, as nearly as I can recollect it.
It is said that brother Joseph in his lifetime declared that the Elders of this Church should step forth at a particular time when the Constitution should be in danger, and rescue it, and save it. This may be so; but I do not recollect that he said exactly so. I believe he [Joseph] said something like this - that the time would come when the Constitution and the country would be in danger of an overthrow; and said he, If the Constitution be saved at all, it will be by the Elders of this Church. I believe this is about the language, as nearly as I can recollect it.
 Joseph Smith, Jr.

Quotes from the same author

A question may be asked, 'Will mothers have their children in eternity?' Yes! Yes! Mothers, you shall have your children.
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 Joseph Smith, Jr.
I told the brethren that the Book of Mormon was the most correct of any book on earth, and the keystone of our religion, and a man would get nearer to God by abiding by its precepts, than by any other book.
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 Joseph Smith, Jr.
The Mayor, Aldermen and Councilors of the City of Nauvoo, IL, before entering upon the duties of their office, shall take and subscribe an oath or affirmation that they will support the Constitution of the United States, and of this State and that they will well and truly perform the duties of their offices to the best of their skill and abilities.
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 Joseph Smith, Jr.
You will live to see men arise in power in the Church who will seek to put down your friends and the friends of our Lord and Savior, Jesus Christ. Many will be hoisted because of their money and worldly learning which they seem to be in possession of; and many who are the true followers of our Lord and Savior will be cast down because of their poverty.
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 Joseph Smith, Jr.
God hath not revealed anything to Joseph, but what he will make known unto the Twelve, and even the least Saint may know all things as fast as he is able to bear them.
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 Joseph Smith, Jr.