[…] I have read many books that offer a new metaphysical vocabulary, an alternative pantheon, a reconstructed cult, or an ingenious magical technology. Black Pilgrimage attempts something more radical: it changes the position from which one perceives at all. Its world is genuinely poly-daemonic. River, forest, city, grave, body, mood, season, ancestor and god are presences, agencies, faces of an answering phenomenal All.

[…] Die gesamte Aufmachung des Werks zeigt eine grosse Schaffensfreude und Begeisterung aller Beteiligten. Die vielen Abbildungen, Zeichnungen und Vignetten ergänzen die Texte sinnvoll. Sie laden zur Meditation und zum Verweilen ein.

[…] Marshall does more than look behind the curtain – he shows you how the wizard made it work. This book is an amazing piece of research and an even more amazing piece of writing.

In his review, Scott Gosnell takes us on a journey through the living lineage of the Olympic Spirits — from Trithemius and Paracelsus, through Rosicrucian and early modern currents, to twentieth-century folk magic — showing how The Olympic Spirits reconstructs a forgotten tradition that spans nearly five centuries.