"Who were these delegates, those whom the Lord designated “wise men” whom he raised up? They were mostly young men in the prime of their life, their average age being forty-four. Benjamin Franklin was the eldest at eighty-one. George Washington, the presiding officer at the convention, was fifty-five. Alexander Hamilton was only thirty-two; James Madison, who recorded the proceedings of the convention with his remarkableNotes, was only thirty-six. These were young men, but men of exceptional character, “sober, seasoned, distinguished men of affairs, drawn from various walks of life.” -J Reuben Clark, Jr 
(Stand Fast by OurConstitution, Deseret Book Co., 1965, p. 135.)

“Our Constitution was made only for a moral and religious people. It is wholly inadequate to the government of any other.” -John Adams 

“I reverence the Constitution of the United States as a sacred document. To me its words are akin to the revelations of God, for God has placed His stamp of approval upon it.” – Ezra Taft Benson, Our Divine Constitution

“Those men who laid the foundation of this American government were the best spirits the God of heaven could find on the face of the earth. They were choice spirits … [and] were inspired of the Lord” -Wilford Woodruff
(Conference Report, Apr. 1898, p. 89)

“Before I left St. George, the spirits of the dead gathered around me, wanting to know why we did not redeem them. Said they, ‘You have had the use of the Endowment House for a number of years, and yet nothing has ever been done for us. We laid the foundation of the government you now enjoy, and we never apostatized from it, but we remained true to it and were faithful to God’” -Wilford Woodruff 
(The Discourses of Wilford Woodruff, sel. G. Homer Durham, Salt Lake City: Bookcraft, 1946, p. 160).