"People in the present day will be slow to believe that any knowledge worth considering can be found outside the bright focus of Western culture. Modern science has accomplished grand results by the open method of investigation, and is very impatient of the theory that persons who ever attained to real knowledge, either in sciences or metaphysics, could have been content to hide their light under a bushel. So the tendency has been to conceive that occult philosophers of old- Egyptian priests, Chaldean Magi, Essenes, Gnostics, theurgic Neo-Platonists, and the rest-who kept their knowledge secret, must have adopted that policy to conceal the fact that they knew very little. Mystery can only have been loved by charlatans who wished to mystify. The conclusion is pardonable from the modern point of view, but it has given rise to an impression in the popular mind that the ancient mystics have actually been turned inside out, and found to know very little. This impression is absolutely erroneous. (Introduction)"