What are the sources of LDS theology that an LDS theologian need to consult to write a systematic theology?

I came across an essay published in BYU Studies journal 54.1 (2015) ["Toward a Mormon Systematic Theology - Essay on *Wrestling the Angel* by Terryl L. Givens"](https://byustudies.byu.edu/content/toward-mormon-systematic-theology-essay-wrestling-angel-terryl-l-givens-0) . I was *surprisingly pleased* by signs of cross fertilization in theological constructions between LDS and mainstream Christianity. Stephen H. Webb, the author, was a Roman Catholic who also wrote a 2015 book [Catholic and Mormon: A Theological Conversation](https://www.amazon.com/Catholic-Mormon-Conversation-Stephen-Webb-ebook/dp/B0102TBHC8) , also [reviewed in the same journal](https://byustudies.byu.edu/content/catholic-and-mormon-theological-conversation-0) . The key points that jumped for me is "**open canon**", and aversion to writing systematic theology and to creeds (which by contrast, a well defined practice for many mainstream Christian denominations). While in the mainstream denominations theology keeps being redefined in every philosophical age (to respond to new worldviews), and currently mainstream denominations are undergoing *yet* another redefinition by revisiting what the church fathers said, *the sources of the theology have remained relatively constant, which include creeds and **closed canon***. Yes, in Catholicism there is the living Magisterium, and there is the living Holy Spirit, but both living voices cannot contradict the voice of the original authors of the closed canon. So there is **stability which grounds flexibility**; flexibility obtained by new research into Ancient Near Eastern background, new hermeneutics (which incorporate the now in vogue narrative criticism, for example), new research into the church fathers period, new appropriation of medieval theology, etc. My question is: "**If an LDS theologian wishes to write a systematic theology in the established genre of the mainstream denominations, what sources of authority one needs to consult?**" Of course the Bible and the Book of Mormon is high in the list. But what about LDS Church leaders / councils / prophets? Will there be new revelations that need to be taken into account? What are the ranking of authority compared to the Bible & the Book of Mormon? Can there be a prophet in the future? How about Reason and Philosophy, how are they ranked in terms of authority compared to [three-legged-stool teaching in Anglicanism](https://episcopalchurch.org/library/glossary/authority-sources-anglicanism) for example? (BTW, the answer to this sub-question maybe found in a 2010 book [Faith, Philosophy, Scripture](https://scholarsarchive.byu.edu/mi/33/) by BYU philosophy professor [James E. Faulconer](https://www.fairmormon.org/testimonies/scholars/james-e-faulconer)) . Quotes from the review (***emphasis** mine*): > Nevertheless, for all its orderliness, Givens actually denies that his book is a work of systematic theology, calling it instead a “study of the foundations of Mormon thought and practice” (ix). I take such denials as a nod to nervousness in the Mormon community about attempts by individuals without a prophetic vocation to bring order to the capacious house of Joseph’s many ideas. That is understandable, but **I look forward to the day when Mormon theologians** (and yes, while Givens is a professor of religion and literature, he is most assuredly a Mormon and a theologian) **do not feel the need to use their church’s “open canon” to claim that “Mormon doctrine is by definition impossible to fix”** (x). Every Christian tradition that is open to the Holy Spirit is living and evolving and thus difficult to pin down. Even the most biblically focused Christian traditions tend to operate with a “canon within a canon” whose boundaries are hard to fix, and magisterial church traditions supplement the closed canon with the openness of creeds and councils. Mormons are in pretty much the same position as every other Christian tradition with regard to systematic theology; which is to say, there are lots of sources of authority to be juggled and few certainties to be found, but much delightful work to sustain the life of any curious mind. Brigham Young called theology a “celestial science” (6), and I couldn’t agree more. When Givens emphasizes how Mormon theology must be provisional and incomplete, he is describing theology as such; on this point, Mormons, I regret to say, are not all that special. > > I think Givens’s book will go a long way toward calming Mormon theological worries that system building can assume creedal dimensions. Despite his occasional rhetoric to the contrary, his systematic ambitions are clear; yet his aim, appropriately, is doctrinal complexity, not creedal simplicity. Givens is convinced that Mormon foundations have to be put in the context of both continuities with and departures from ancient and contemporary Christian traditions. **While systematic theology for churches that are more certain of their location within the broader stream of the faith can afford to be formal and abstract, the intelligibility of Mormon doctrine cannot be elaborated outside a comparative methodology grounded in a historical narrative about the development of church doctrine.** Mormonism’s claim to represent the fullness of Christian faith requires nothing less. > > **Givens points out that the Latter-day Saints do not have a counterpart to Catholicism’s Catechism and that the 1842 Articles of Faith “contain relatively few of Mormonism’s key beliefs”** (6). Yet it is my experience that the Saints have done a better job than any other Christian church in instructing their members in the doctrinal basics of their faith. When it comes to theology, Mormons protest too much. The theological practices of the Saints are much more systematic than their rhetorical apologies for being unsystematic would suggest. What the Saints say about theology needs to be brought into closer alignment with what they actually accomplish through education, publishing, and conferencing venues, which is quite impressive indeed. > > As demonstrated by his very fine analysis of Mormon views of apostasy, Givens keeps the fullness of the restored gospel front and center. “In Smith’s scheme of restoration, any pruning of accretions is meant to clear the way for the tree’s trunk to reattain the fullness of its original foliage” (19). Such flowery language is a testament to the decades Givens has spent immersed in the literature of the romantics, and indeed the overall aim of Givens’s project is to situate Mormon thought in the ancient past of the church, with all of its exotic richness, **rather than in the Protestant Reformation’s narrower explication of the three solae (scripture, grace, and faith). In Givens’s hands, Joseph comes across as a lot closer to Origen than Calvin—and Joseph also comes across as a more theologically explicit variant of Wordsworth, Blake, and Coleridge.**