Note 10 — from the Origins To the Renaissance

He says, in reference to the pupils of the Druids, "De Bello Gallico," book vi.: "Magnum ibi numerum versuum ediscere dicuntur, itaque nonnulli annos vicenos in disciplina permanent; neque fas esse existimant ea litteris mandare." One of the reasons of this interdiction is to guard against the scholars ceasing to cultivate their memory, a faculty considered by the Celts as of the highest importance.