What does "living tradition" mean in Unitarian Universalism?

Living tradition - Why is Unitarian Universalism called “a living tradition”?

Because it has no fixed creed or orthodoxy but is a living, ever evolving, explanation of the perennial wisdom which is the basis for our spiritual vision and understanding.

This post is one in a series composing a dictionary of Unitarian Universalist literacy. These are terms and phrases which all informed UUs should know.