Edmund Crosby Quiggin, 1911 Encyclopædia Britannica, Volume 8… (1911)
“ As they were not a hereditary caste and enjoyed exemption from service in the field as well as from payment of taxes, admission to the order was eagerly sought after by the youth of Gaul. The course of training to which a novice had to submit was protracted, extending sometimes over twenty years. All instruction was communicated orally, but for ordinary purposes they had a written language in which they used the Greek characters. The president of the order, whose office was elective and who enjoyed the dignity for life, had supreme authority among them. They taught that the soul was immortal. ”
