Did you know that in the LDS Church, the scriptures are supposed to be the final authority even when they disagree with the modern prophet? Every prophet has their own opinions, Like Hinckley's campaign "Mormon means More Good" and Nelson's "Using the term Mormon is a win for Satan". The Standard Works are the standard that everyone and everything in the church is judged by.
Bruce R. McConkie letter to Dr. England,
"Prophets are men and they make mistakes. Sometimes they err in doctrine. This is one of the reasons the Lord has given us the Standard Works. They become the standards and the rules that govern where doctrine and philosophy are concerned. If this were not so, we would believe one thing when one man was president of the Church and another thing in the days of his successors."
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"Nothing is to be taught as doctrine except that which accords with the standard works."
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"The standard works are the written measure of all doctrine."
President Joseph Fielding Smith
“STANDARD WORKS JUDGE TEACHINGS OF ALL MEN. It makes no difference what is written or what anyone has said, if what has been said is in conflict with what the Lord has revealed, we can set it aside. My words, and the teachings of any other member of the Church, high or low, if they do not square with the revelations, we need not accept them. Let us have this matter clear. We have accepted the four standard works as the measuring yardsticks, or balances, by which we measure every man’s doctrine.
You cannot accept the books written by the authorities of the Church as standards in doctrine, only in so far as they accord with the revealed word in the standard works.
Every man who writes is responsible, not the Church, for what he writes. If Joseph Fielding Smith writes something which is out of harmony with the revelations, then every member of the Church is duty bound to reject it.
If he writes that which is in perfect harmony with the revealed word of the Lord, then it should be accepted.” (Joseph Fielding Smith, Doctrines of Salvation, comp. Bruce R. McConkie, 3:203–204
President Harold B. Lee
"If it is not in the standard works, you may well assume that it is speculation."
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"The only safe way for us is to ... measure every teaching, every principle, every doctrine against the scriptures."
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"We are to try all teachings by the standard works."
President Russell M. Nelson
"Doctrine does not change. Personal covenants do not change. The ordinances do not change."