Israel Regardie’s The Tree of Life: A Study in Magic (1932) is widely regarded as his magnum opus and a definitive text of the Western Mystery Tradition. Written when Regardie was only 24, the book aimed to clarify and synthesize the complex teachings of the Hermetic Order of the Golden Dawn and Aleister Crowley for a general audience. Core Themes and Content Go to product viewer dialog for this item. The Tree of Life: An Illustrated Study in Magic