The Stromata
Clement of Alexander
Numa the king of the Romans was a Pythagorean, and aided by the precepts of Moses, prohibited from making an image of God in human form, and of the shape of a living creature. Accordingly, during the first hundred and seventy years, though building temples, they made no cast or graven image. For Numa secretly showed them that the Best of Beings could not be apprehended except by the mind alone. Thus philosophy, a thing of the highest utility, flourished in antiquity among the barbarians, shedding its light over the nations. And afterwards it came to Greece. First in its ranks were the prophets of the Egyptians; and the Chaldeans among the Assyrians; and the Druids among the Gauls; and the Samanaeans among the Bactrians; and the philosophers of the Celts; and the Magi of the Persians, who foretold the Saviour's birth, and came into the land of Judaea guided by a star. The Indian gymnosophists are also in the number, and the other barbarian philosophers. And of these there are two classes, some of them called Sarmanae, and others Brahmins. And those of the Sarmanae who are called Hylobii neither inhabit cities, nor have roofs over them, but are clothed in the bark of trees, feed on nuts, and drink water in their hands. Like those called Encratites in the present day, they know not marriage nor begetting of children.
Clement of Alexandria: The Stromata, or Miscellanie. Excerpted from Ante-Nicene Fathers, Volume 2. Edited by Alexander Roberts & James Donaldson. American Edition, 1885. New Advent