The Ordeal of Mercy is a book of wide erudition and simple style; its goal is to present the Purgatorio, according to the science of spiritual psychology, as a practical guide to travelers on the Spiritual Path. The author draws upon many sources: the Greek Fathers, notably Maximos the Confessor; St. John Climacus; Fathers and Doctors of the Latin Church, including St. Augustine and St. Thomas Aquinas; John Donne, William Blake and other metaphysical poets; the doctrines of Dante's own initiatory lineage, the Fedeli d'Amore; the modern Eastern Orthodox writers Pavel Florensky and Jean-Claude...