The term "propensity" has been used in literature to convey an inherent or natural tendency that shapes behavior, thought, or even biological processes. In philosophical and moral contexts, writers such as Hume, Kant, and Rousseau [1, 2, 3, 4, 5, 6, 7, 8] employ the word to highlight innate inclinations—whether toward virtue, vice, or the subtleties of self-assessment and regulation [9, 10, 11]. At the same time, literary authors have used "propensity" to capture more personal or situational predilections; for example, it describes a character’s exaggerated self-valuation [1], a fierce inclination toward ill deeds [12], or even a natural, almost instinctive attraction observed in both human and animal behavior [13, 14]. The term also appears in contexts ranging from moral self-scrutiny [15] and social etiquette [16] to critiques of cultural practices [17] and descriptions of everyday quirks [18, 19]. Overall, its versatility in literature underscores the way human nature—whether in its noble or ignoble manifestations—is often thought to be dictated by a fundamental, if mutable, propensity.