Among archetypal images, the Sacred Tree is one of the most widely know
symbols on Earth. There are few cultures in which the Sacred Tree does
not figure: as an image of the cosmos, as a dwelling place of gods or spirits,
as a medium of prophecy and knowledge, and as an agent of metamorphoses
when the tree is transformed into human or divine form or when it bears
a divine or human image as its fruit or flowers.
- Christopher and Tricia McDowell, The Sanctuary Garden, 1998, p 128