The Venerable Bede composed On the Nature of Things (De natura rerum) and On Times (De temporibus) at the outset of his career, about AD 703. Bede fashioned himself as a teacher to his people and his age, and these two short works show him selecting, editing, and clarifying a mass of difficult and sometimes dangerous material. He insisted that his reader understand the mathematical and physical basis of time, and though he was dependent on his...