Quote by Terry Pratchett
Time and space were, from Death's point of view, merely things that he'd heard described. When it came to Death, they ticked the box marked Not Applicable. It might help to think of the universe as a rubber sheet, or perhaps not.
Summary
This quote suggests that Death, as an entity, doesn't experience the concepts of time and space as humans do. Time and space are only known to Death through descriptions, yet they hold no relevance or applicability to Death itself. The comparison of the universe to a rubber sheet adds a touch of uncertainty, perhaps indicating that there are alternate ways to perceive or understand the nature of reality beyond our conventional understanding.