Gordon B. Hinckley, We recognize the good in all churches. We recognize the value of religion generally. We say to everyone: live the teachings which you have received from your church. We invite you to come and learn from us, to see if we can add to those teachings and enhance your life and your understanding of things sacred and divine. Now we work with people of other faiths on common causes, many of them across the world. We recognize theological differences. We believe that we can disagree theologically without being disagreeable, and we hope to do so. We have been rather careful about surrendering in any way our doctrinal standards, anything of that kind as part of an ecumenical effort, but we certainly have worked with people, and do work with people, and want to work with other groups in tackling common social problems, things of that kind which are so much in need of attention these days throughout the world (interview with Lawrence Spicer, London News Service, 28 Aug. 1995).
Gordon B. Hinckley, Remarks at Pioneer Day Commemoration Concert:
"This city and state have now become the home of many people of great diversity in their backgrounds, beliefs, and religious persuasions. I plead with our people to welcome them, to befriend them, to mingle with them, to associate with them in the promulgation of good causes."
"As I have said before, we must not be clannish. We must never adopt a holier-than-thou attitude. We must not be self-righteous. We must be magnanimous and open and friendly. We can keep our faith. We can practice our religion. We can cherish our method of worship without being offensive to others. I take this occasion to plead for a spirit of tolerance and neighborliness, of friendship and love toward those of other faiths."
Joseph Smith, Articles of Faith 1:11 "We claim the privilege of worshiping Almighty God according to the dictates of our own conscience, and allow all men the same privilege, let them worship how, where, or what they may."
Brigham Young: To be adverse to Gentiles [as the word was then used], because they are Gentiles, or Jews, because they are Jews, is in direct opposition to the genius of our religion. It matters not what a mans creed is, whether it be Catholic, or Episcopalian, Presbyterian, Methodist, Baptist, Quaker, or Jew, he will receive kindness and friendship from us (quoted in Preston Nibley, Brigham Young: The Man and His Work [1936], 416).
Although they don't speak for the church authoritatively, quite a few others have expressed opinions in similar directions that have been published in church magazines:
L. Harold Wright, We Made Friends from Other Faiths, Ensign, June 1976, 52
http://library.lds.org/nxt/gateway....20faiths%20.htm
Gerald E. Jones, Respect for Other Peoples Beliefs, Ensign, Oct. 1977, 69
http://library.lds.org/nxt/gateway....s%20beliefs.htm