I say that we need to teach our people to find their answers in the scriptures. If only each of us would be wise enough to say that we aren’t able to answer any question unless we can find a doctrinal answer in the scriptures! And if we hear someone teaching something that is contrary to what is in the scriptures, each of us may know whether the things spoken are false—it is as simple as that. But the unfortunate thing is that so many of us are not reading the scriptures. We do not know what is in them, and therefore we speculate about the things that we ought to have found in the scriptures themselves. I think that therein is one of our biggest dangers of today.
The Teachings of Harold B. Lee, ed. Clyde J. Williams (1996), 153.
If anyone, regardless of his position in the Church were to advance a doctrine that is not substantiated by the standard Church works, meaning the Bible, the Book of Mormon, the Doctrine and Covenants, and the Pearl of Great Price, you may know that his statement is merely his private opinion. The only one authorized to bring forth any new doctrine is the President of the Church, who, when he does, will declare it as revelation from God, and it will be so accepted by the Council of the Twelve and sustained by the body of the Church. And if any man speak a doctrine which contradicts what is in the standard Church works, you may know by that same token that it is false and you are not bound to accept it as truth
Harold B. Lee, The First Area General Conference for Germany, Austria, Holland, Italy, Switzerland, France, Belgium, and Spain of the Church of Jesus Christ of Latter-day Saints, held in Munich Germany, August 24-26, 1973, with Reports and Discourses, 69.