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Thanks for your letter of April 15, 1955. I am happy that you read my letter, which you refer to, as it expresses accurately my point of view.
Given the differences in training of the members of the Church, I never cease to marvel at the degree of agreement found among believing Latter- day Saints. So far from being disturbed to find that Brother Talmage, Brother Widtsoe and yourself didn’t always see scientific matters alike, this situation seems natural and as it should be. It will be a sad day for the Church and its members when the degree of disagreement you brethren expressed is not allowed.
I am convinced that if the Lord required that His children understand His works before they could be saved that no one would be saved. It seems to me that to struggle for agreement on scientific matters in view of the disparity in background which the members of the Church have is to put emphasis on the wrong place. In my judgment there is room in the Church for people who think that the periods of creation were (a) 24 hours, (b) 1000 years, or (c) millions of years. I think it is fine to discuss these questions and for each individual to try to convert the other to what he thinks is right, but in matters where apparently equally reliable authorities disagree, I prefer to make haste slowly.
Since we agree on so many things, I trust we can amicably disagree on a few. I have never liked, for example, the idea that many of the horizontally lying layers with their fossils are wreckage from earlier worlds. In any case, the Lord created the world and my faith does not hinge on the detailed procedures.
Thanks again for your kindly, thoughtful letter.
(Letter from Henry Eyring to Joseph Fielding Smith, quoted in "Mormon Scientist: The Life and Faith of Henry Eyring" by Henry J. Eyring)
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From the father of Henry Eyring
"Henry, we’ve ridden together on the range, and we’ve farmed together. I think we understand each other. Well, I want to say this to you: I’m convinced that the Lord used the Prophet Joseph Smith to restore his church. For me that is a reality. I haven’t any doubt about it. Now, there are a lot of other matters which are much less clear to me. But in this Church you don’t have to believe anything that isn’t true. You go over to the University of Arizona and learn everything you can, and whatever is true is a part of the gospel. The Lord is actually running this universe. I’m convinced that he inspired the Prophet Joseph Smith. And I want to tell you something else: if you go to the university and are not profane, if you’ll live in such a way that you’ll feel comfortable in the company of good people, and if you go to church and do the other things that we’ve always done, I don’t worry about your getting away from the Lord."
("My Father’s Formula" By Henry Eyring, Ensign Oct 1978)