[74] And in the land of the barbarians, in which the same men are authorities both as to words and actions, there are very numerous companies of virtuous and honourable men celebrated. Among the Persians there is the body of the Magi, who, investigating the works of nature for the purpose of becoming acquainted with the truth, do at their leisure become initiated themselves and initiate others in the divine virtues by very clear explanations. And among the Indians there is the class of the gymnosophists, who, in addition to natural philosophy, take great pains in the study of moral science likewise, and thus make their whole existence a sort of lesson in virtue.