From Caesar's Bello Gallico, Book Six:
(13.1) In all of Gaul there are two kinds of those people that are of any number and honour. For the plebs are held almost as slaves, that dare nothing on their own, nor are summoned to any council.
(13.2) The majority, whenever they are oppressed by debt, or magnitude of taxes, or injury by the more powerful, they give themselves over to slavery to the nobles, who have all the same rights over these as masters over slaves.
(13.3) But of these two kinds one is the druids, the other is the knights.
(13.4) The former take part in things holy, attend to public and private sacrifices, interpret religious matters: and to these men a great number of young men gather around to learn and these men are in great honour among them.
(13.5) For they decide about almost all of public and private disputes and if any evil deed has been committed, if a murder has been committed, if there is a dispute of inheritance, of territory, the same men decide, set up awards and punishments;
(13.6) if someone private or people does not stand by their decree, they forbid sacrifices.
(13.7) This punishment is a very heavy one among them. These, to whom there has thus been a forbidding (i.e., these who have been thus forbidden), these men are considered in the number of the wicked and criminal, everyone avoids them, avoids their approach and conversation, lest they get some harm from the contact, nor is justice given to these seeking, nor is any honour shared with them.
(13.8) But of all these druids one is in charge, who has chief authority among them.
(13.9) When this one has died, either, if one of the remaining (druids) excels in dignity, he succeeds, or, if many are equal, they contend for the leadership either by the voite of the druids or sometimes even by arms.
(13.10) These men, at a fixed time of the year, sit down in a consecrated place in the territory of Carnutes, which region is considered the center of all Gaul. To here everybody from all sides who has disputes comes together and they obey their decrees and judgements.
(13.11) Teaching is thought to have been discovered in Britain and thence when transported into Gaul, and now those who rather diligently want to know these things, the majority set out to there to study.
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(14.1)--The Druids do not go to war, nor pay tribute together with the rest; they have an exemption from military service and a dispensation in all matters.
(14.2) Induced by such great advantages, many embrace this profession of their own accord, and [many] are sent to it by their parents and relations.
(14.3) They are said there to learn by heart a great number of verses; accordingly some remain in the course of training twenty years.
(14.4) Nor do they regard it lawful to commit these to writing, though in almost all other matters, in their public and private transactions, they use Greek characters.
(14.5) That practice they seem to me to have adopted for two reasons; because they neither desire their doctrines to be divulged among the mass of the people, nor those who learn, to devote themselves the less to the efforts of memory, relying on writing; since it generally occurs to most men, that, in their dependence on writing, they relax their diligence in learning thoroughly, and their employment of the memory.
(14.6) They wish to inculcate this as one of their leading tenets, that souls do not become extinct, but pass after death from one body to another, and they think that men by this tenet are in a great degree excited to valor, the fear of death being disregarded.
(14.7) They likewise discuss and impart to the youth many things respecting the stars and their motion, respecting the extent of the world and of our earth, respecting the nature of things, respecting the power and the majesty of the immortal gods.
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(18.1) All the Gauls assert that they are descended from the god Dis, and say that this tradition has been handed down by the Druids.
(18.2) For that reason they compute the divisions of every season, not by the number of days, but of nights; they keep birthdays and the beginnings of months and years in such an order that the day follows the night.
(18,3) Among the other usages of their life, they differ in this from almost all other nations, that they do not permit their children to approach them openly until they are grown up so as to be able to bear the service of war; and they regard it as indecorous for a son of boyish age to stand in public in the presence of his father.
http://ancienthistor...logallico_6.htm