Let me also add these comments:
From B.H. Roberts
I do not think the world should require such perfection of us as to insist that our religious teachers always deliver the inerrant word of God! In any event it must be allowed by us that many unwise things were said in times past, even by prominent elders of the Church; things that were not in harmony with the doctrines of the Church; and that did not possess the value of scripture, or anything like it; and it was not revelation. Moreover, no revelation even becomes the doctrine of the Church of Jesus Christ of Latter-day Saints until it is accepted by that Church by formal action; it must be accepted by official vote of the Church before it becomes the law of the Church."
From Joseph F. Smith
"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 teaching 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 mans doctrine. You cannot accept the books written by 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
From Harold B. Lee:
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 the same token that it is false and you are not bound to accept it as truth.