The UUA explicitly affirms multiple sources of religious insight and wisdom beyond the Bible. The UUA's 'Six Sources' statement — adopted in 1984 as part of the revised Principles and Purposes — lists: direct experience of transcending mystery and wonder; words and deeds of prophetic people (across all cultures and traditions); wisdom from world religions (Jewish, Christian, and others); Jewish and Christian teachings; humanist philosophy; and earth-centered spirituality.

This pluralistic approach to revelation means that for UU members, spiritual insight can come from the Bible, from the Tao Te Ching, from Buddhist meditation, from ecological experience, from scientific discovery, and from personal reflection and community discernment. No single tradition is held to have a monopoly on religious truth, and the free search for meaning is itself affirmed as the primary religious method.

The UUA's affirmation of multiple sources of religious insight is one of its most distinctive theological commitments and represents a fundamental departure from Protestant Christianity's sola scriptura principle. For the UUA, the tradition — the accumulated wisdom of all human religious experience — is the living source from which each generation draws, tests, and renews its understanding of ultimate reality and human meaning.