The First Presidency (Joseph F. Smith, Anthon H. Lund, and Charles W. Penrose) wrote the following in 1913 about those who make false claims or declare erroneous doctrines:
“When visions, dreams, tongues, prophecy, impressions or any extraordinary gift or inspiration conveys something out of harmony with the accepted revelations of the Church or contrary to the decisions of its constituted authorities, Latter-day Saints may know that it is not of God, no matter how plausible it may appear. Also they should understand that directions for the guidance of the Church will come, by revelation, through the head. All faithful members are entitled to the inspiration of the Holy Spirit for themselves, their families, and for those over whom they are appointed and ordained to preside. But anything at discord with that which comes from God through the head of the Church is not to be received as authoritative or reliable. In secular as well as spiritual affairs, Saints may receive Divine guidance and revelation affecting themselves, but this does not convey authority to direct others, and is not to be accepted when contrary to Church covenants, doctrine or discipline, or to known facts, proven truths, or good common sense. No person has the right to induce his fellow members of the Church to engage in speculations or take stock in ventures of any kind on the specious claim of Divine revelation or vision or dream, especially when it is in opposition to the voice of recognized authority, local or general. The Lord’s Church ‘is a house of order.’ It is not governed by individual gifts or manifestations, but by the order and power of the Holy Priesthood as sustained by the voice and vote of the Church in its appointed conferences.
“The history of the Church records many pretended revelations claimed by imposters or zealots who believed in the manifestations they sought to lead other persons to accept, and in every instance, disappointment, sorrow and disaster have resulted therefrom. Financial loss and sometimes utter ruin have followed. . . .
“Be not led by any spirit or influence that discredits established authority, contradicts true scientific principles and discoveries, or leads away from the direct revelations of God for the government of the Church. The Holy Ghost does not contradict its own revealings. Truth is always harmonious with itself. Piety is often the cloak of error. The counsels of the Lord through the channel he has appointed will be followed with safety. Therefore, O! ye Latter-day Saints, profit by these words of warning.”
In Clark, Messages of the First Presidency, 4:285–86. Also found in Doctrine and Covenants Institute Student Manual, Enrichment J-7: Keys for Avoiding Deception.