Iamblichus on the mysteries of the Egyptians, Chaldeans, and Assyrians

It appears to me that there are two descriptions of persons by whom the present work must be considered to be of inestimable worth, the lovers of antiquity and the lovers of ancient philosophy and religion. To the former of these it must be invaluable, because it is replete with information derived from the wise men of the Chaldeans, the prophets of the Egyptians, the dogmas of the Assyrians, and the ancient pillars of Hermes; and to the latter, because of the doctrines contained in it, some of which originated from the Hermaic pillars, were known by Pythagoras and Plato, and were the sources of their philosophy; and others are profoundly theological, and unfold the mysteries of ancient religion with an admirable conciseness of diction, and an inimitable vigour and elegance of conception. To viiiwhich also may be added, as the colophon of excellence, that it is the most copious, the clearest, and the most satisfactory defence extant of genuine ancient theology.