Strabo, lib.

4.] No species of superstition was ever more terrible than that of the Druids.

Besides the severe penalties, which it was in the power of the ecclesiastics to inflict in this world, they inculcated the eternal transmigration of souls; and thereby extended their authority as far as the fears of their timorous votaries.

They practised their rites in dark groves or other secret recesses [g]; and in order to throw a greater mystery over their religion, they communicated their doctrines only to the initiated, and strictly forbad the committing of them to writing, lest they should at any time be exposed to the examination of the profane vulgar.

Human sacrifices were practised among them: the spoils of war were often devoted to their divinities; and they punished with the severest tortures whoever dared to secrete any part of the consecrated offering; these treasures they kept in woods and forests, secured by no other guard than the terrors of their religion [h]; and this steady conquest over human avidity may be regarded as more signal than their prompting men to the most extraordinary and most violent efforts.