A History of Universalism: Modern Christian Universalists convincingly (to me) trace their faith back to the first centuries of Christianity.
1915, Clarence Russell Skinner, "Social Implications of Universalism" (II-38)
1917, "Universalist Commission on Social Services, "A Declaration of Social Principles" (II-67)
1942, Trustees of the Universalist Church of America "Proposed and Final Applications for Membership in the Federal Council of Churches" (II-121)
1958,
Joint Merger Commission, "Information Manual" (II-175)
(full text)
Albert Q. Perry,
1958: "The Uniqueness of Universalism" (II-180)
1960: "Decisions and Implications" (II-205)
Gordon McKeeman
1959: "The Place of Hosea Ballou in Present-Day Universalism" (II=184)
1960: "Questions About Jesus" (II-202)
1959, Irving R. Murray, "A Case For Merger" (II-187)
Walter Donald Kring,
1959: "A Case Against Merger" (II-190)
1960: "We Ought To Be (II-210)
"Constitution of the Unitarian Universalist Association" (II-195)
1960,
Dana McLean Greeley,
"Frankly Speaking" (II-208)
Donald S. Harrington,
"We Are That Faith" (II-213)
2011,
Marilyn Sewell,
Why Unitarians and Universalists Belong Together: A Fifty-Year Recollection
Because I couldn't find any commentary by women at the time of the merger...
1900,
Eleanor Elizabeth Gordon,
"Our Mission to Save by Culture" (II-1)
(See also Mary Augusta Safford)
1915, May Wright Sewall, "Women, World War, and Permanent Peace" (II-56)
1920, Olympia Brown "The Opening Doors" (II-71)
1923, Charlotte Perkins Gilman, "His Religion and Hers" (II-75)
1940,
Aurelia Henry Reinhard,
"Education for Service in Democracy" (II-105)
Martha Sharp,
"Food for Babies in the Basses Pyrenees: Emergency Project, Summer, 1940" (II-108)
(See also Waitstill Sharp and
"Righteous among the nations" by Michelle Bates Deakin, UUWorld, Summer 2006)
1952, Sophia Lyon Fahs, "Today's Children and Yesterday's Heritage" (II-164)
1961, Dorothy Spoerl, "Is Our Religious Education Religious?" (II-228)
1962, Alliance of Unitarian Women and Association of Universalist Women, "Churchwoman.... or Churchmouse?" (II-230)
1970, ""General Resolution on Equal Rights and Opportunities for Women" (II-306)
1917,
John Haynes Holmes and the debate over World War I (II-59)
William Howard Taft chairs a debate over World War I at the Unitarian General Conference in Toronto (II-63)
1936, Commission of Appraisal, "Unitarians Face a New Age" (II-91) (full text)
James Luther Adams,
1939, "Why Liberal" (II-101)
(More on totalitarianism and America)
1941, "The Changing Reputation of Human Nature" (II-110)
1962, "The Indispensable Discipline of Social Responsibility" (II-231)
Frederick May Eliot
1942, "Bring in the Candles"(II-119)
1947, "The Message and Mission of Liberal Religion" (II-150)
1942, Norbert Capek, "Songs Composed in Dresden Prison", (II-116)
1945, American Unitarian Youth, "Political Resolution" (II-124)
2003, Neil Shister in UUWorld, "Embattled Faith"
1909, Charles W. Eliot "The Religion of the Future (II-29-31)
1917, Clarence Skinner, "Social Implications of Unitarianism" (II-38-55)
1926, Curtis W. Reese
"Humanism" (II-78-80)
1927, John Dietrich
"Unitarianism and Humanism" (II-81-83)
1933, "The Humanist Manifesto" (II_84-88)
Supplemental reading online:
New York Times, February 27, 1917,
"Dr. Eliot's Belief"
William F. Schulz 2003 UUWorld article
"Our Humanist Legacy: Seventy years of religious humanism"
Susan Casteel 2006 paper (PDF),
"The Humanist-Theist Controversy"