The Lamp of the Sanctuary is the most important theological encyclopedia in the Syriac language and its author Gregory Bar Hebraeus was perhaps the greatest polymath ever to write in Syriac. The book is divided into twelve different sections which span the breadth of medieval theology. The first section deals with simple knowledge. The second, with the nature of created things. The third, with theoretical theology. The fourth, with the Incarnation of the Word of God. The fifth, with angels. The sixth, with the priesthood. The seventh, with evil spirits and demons. The eighth, with the rational soul. The ninth, with free will and determinism. The tenth, with the Resurrection of the body. The eleventh, with the Last Judgment. And finally, the twelfth and last section deals with Paradise. Dionysios Behnam Jijawi has here done the herculean task of rendering the entire work into Arabic, a service which will be deeply appreciated by those interested in a number of fields—philosophy, theology, natural philosophy, and the history of Middle Eastern Christianity, among others.