Throughout literature, the word “sure” serves as a flexible marker of certainty, assurance, or even tentative belief. In some contexts it conveys absolute confidence—for instance, characters affirming conviction about events or qualities, as when a speaker confidently declares, “I am sure I shall break mine” [1] or asserts that “you may be sure” of enjoying liberty [2]. In other passages, it introduces nuance by balancing certainty with an undercurrent of doubt, as in the careful reasoning found in reflective narratives [3] or a disarming exclamation amid fantastical encounters [4]. Authors ranging from Shakespeare and Dickens to Austen and beyond employ “sure” not only to punctuate dialogue with colloquial immediacy [5][6] but also to subtly express philosophical perspectives, as when it hints that certain outcomes are inevitable despite the lack of absolute proof [7]. This varied use underscores the word’s enduring power to shape tone, emotion, and meaning in literary discourse.