“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
The Occult World
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Alfred Percy Sinnett 5
English writer and Theosophist 1840–1921Related quotes

Sydney Interview on the Genbank 25th Anniversary http://www.youtube.com/watch?v=bDm7i3Rc8wU

A Preliminary Discourse on the Study of Natural Philosophy (1831)

Source: A Treatise On Political Economy (Fourth Edition) (1832), Introduction, p. xxvi

Great Books: The Foundation of a Liberal Education (1954)
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Ibn Shu’ba al-Harrani, Tuhaf al-'Uqul, p. 382
Regarding Knowledge & Wisdom, General

is nothing but another and most convenient fairy-tale. Primitive tribes has more detailed classifications of animals and plant than contemporary scientific zoology and botany, they know remedies whose effectiveness astounds physicians (while the pharmaceutical industry already smells here a new source of income), they have means of influencing their fellow men which science for a long time regarded as non-existent (voodoo), they solve difficult problems in ways which are still not quite understood (building of the pyramids; Polynesian travels), there existed a highly developed and internationally known astronomy in the old Stone Age, this astronomy was factually adequate as well as emotionally satisfying, it solved both physical and social problems (one cannot say the same about modern astronomy) and it was tested in very simple and ingenious ways (stone observatories in England and in the South Pacific; astronomical schools in Polynesia - for a more details treatment an references concerning all these assertions cf. my Einfuhrung in die Naturphilosophie). There was the domestication of animals, the invention of rotating agriculture, new types of plants were bred and kept pure by careful avoidance of cross fertilization, we have chemical inventions, we have a most amazing art that can compare with the best achievement of the present. True, there were no collective excursions to the moon, but single individuals, disregarding great dangers to their soul and their sanity, rose from sphere to sphere to sphere until they finally faced God himself in all His splendor while others changed into animals and back into humans again. At all times man approached his surroundings with wide open senses and a fertile intelligence, at all times he made incredible discoveries, at all times we can learn from his ideas.
Pg. 306-307
Against Method (1975)