^ abcdBremer, Thomas S. (2015). "Transcendentalism". Formed From This Soil: An Introduction to the Diverse History of Religion in America. Chichester, West Sussex: Wiley-Blackwell. p. 235. doi:10.1002/9781394260959. ISBN978-1-4051-8927-9. LCCN2014030507. S2CID127980793. Archived from the original on 2023-01-13. Retrieved 2023-01-13. Unitarian theology, which developed in the eighteenth and early nineteenth centuries, included a critique of the traditional Christian theology of the Trinity, which regarded God as three distinct but unified beings—transcendent Creator God, human Savior God (i.e., Jesus Christ), and immanent Spiritual God (i.e., the Holy Spirit). Unitarians viewed this understanding of God as a later theological corruption, and they embraced a view of God as a singular, unified entity; in most Unitarian theological interpretations, Jesus Christ retains highest respect as a spiritual and moral teacher of unparalleled insight and sensitivity, but he is not regarded as divine, or at least his divine nature is not on the same level as the singular and unique Creator God.
^Drzymala, Daren. 2002. Biblical Christianity. Xulon press. p. 122: "Classically, Unitarian Universalist Christians [and Unitarian Christians] have understood Jesus as a Savior because he was a God-filled human being, not a supernatural being."
^Joseph Priestley, one of the founders of the Unitarian movement, defined Unitarianism as the belief of primitive Christianity before later corruptions set in. Among these corruptions, he included not only the doctrine of the Trinity, but also various other orthodox doctrines and usages (Earl Morse Wilbur, A History of Unitarianism, Harvard University Press 1952, pp. 302–303).
^From The Catechism of the Hungarian Unitarian Church in Transylvanian Romania: "Unitarians do not teach original sin. We do not believe that through the sin of the first human couple we all became corrupted. It would contradict the love and justice of God to attribute to us the sin of others, because sin is one's own personal action" (Ferencz Jozsef, 20th ed., 1991. Translated from Hungarian by Gyorgy Andrasi, published in The Unitarian Universalist Christian, Fall/Winter, 1994, Volume 49, Nos. 3–4; VII:107).
^In his history of the Unitarians, David Robinson writes: "At their inception, both Unitarians and Universalists shared a common theological enemy: Calvinism." He explains that they "consistently attacked Calvinism on the related issues of original sin and election to salvation, doctrines that in their view undermined human moral exertion." (D. Robinson, The Unitarians and the Universalists, Greenwood Press, 1985, pp. 3, 17).
^Larsen, Timothy (27 January 2011). A People of One Book: The Bible and the Victorians. Oxford University Press. p. 143. ISBN978-0-19-161433-0. Biblical Unitarians are standardly portrayed as denouncing liberal Unitarians
^Mandelbrote, Scott; Ledger-Lomas, Michael (October 2013). Dissent and the Bible in Britain, C.1650–1950. Oxford University Press. p. 160. ISBN978-0-19-960841-6. Although a biblical Unitarian, Mary Carpenter was lifelong friends with James Martineau, the pioneer of English liberal Unitarianism.
^James Hastings Encyclopaedia of Religion and Ethics: Algonquins-Art p. 785 – 2001 "The first Unitarians were Italians, and the majority took refuge in Poland, where the laxity of the laws and the independence of the nobility secured for them a toleration which would have been denied to their views in other countries."
^The encyclopedia of Protestantism 137 Hans Joachim Hillerbrand – 2004 "The so-called Golden Age of Unitarianism in Transylvania (1540–1571) resulted in a rich production of works both in Hungarian and Latin".
^Erwin Fahlbusch The encyclopedia of Christianity 5 603 2008 "Lindsey attempted but failed to gain legal relief for Anglican Unitarians, so in 1774 he opened his own distinctly Unitarian church on Essex Street, London, where today's British Unitarian headquarters are still located."
^American Unitarianism: or, A Brief history of "The progress and State of the Unitarian Churches in America, third edition, 1815 "So early as the year 1786, Dr. Freeman had persuaded his church to adopt a liturgy, which the Rev. ... Thus much for the history of Unitarianism at the Stone Chapel."