Good friend, ponder this well: a writer's task is hard;
Take, open, read, harm not; finish, refold, restore!

Lines of admonition inscribed on each manuscript he copied for Reichenau's library, as translated by Eleanor Shipley Duckett, Carolingian Portraits: A Study in the Ninth Century (Ann Arbor: University of Michigan Press, 1962) ch. 5, pp. 123–124