The term guarantee in literature serves a dual role, functioning both as a promise of reliability and as a metaphor for certainty or security. Authors deploy it to denote a tangible assurance—such as a financial or political commitment that secures an agreement or outcome [1][2][3]—and also to express more abstract certainties, like the intrinsic validity of an idea or the inevitable nature of certain truths [4][5][6]. In narrative contexts, the word often appears to underline personal credibility or to solidify a bond of trust between characters [7][8][9], while in philosophical works it may represent the inherent foundation of an argument or system, essentially guaranteeing its coherence or persistence [10][11][12].