The eternal truths constituting the gospel do not change, and eventually all who are exalted in the kingdom of God will understand them and apply them fully. However, mankind's knowledge and understanding of these truths change, as do the policies and practices appropriate to concurrent levels of understanding and obedience. Acting collectively and under the inspiration of God, these leaders are authorized to determine the position of the Church at any given time on matters of doctrine, policy, and practice. This is the proper channel through which changes come. It is expected that such revelations will involve an expanded understanding of doctrine.
Many individuals write or preach their views.
Some, by study and obedience, may learn truths that go beyond the stated position of the Church, but this does not authorize them to speak officially for the Church or to present their views as binding on the Church. There are many subjects about which the scriptures are not clear and about which the Church has made no official pronouncements. In such matters, one can find differences of opinion among Church members and leaders. Until the truth of these matters is made known by revelation, there is room for different levels of understanding and interpretation of unsettled issues. The doctrine of the Church was revealed principally through the Prophet Joseph Smith, though subsequent additions and clarifications have been made.