This paper conducts a comparative philosophical investigation of Advaita Vedānta’s doctrine of Sattātraya and Immanuel Kant’s phenomenal–noumenal distinction. Both traditions address the tension between appearance and ultimate reality. However, their approaches reflect radically different philosophical motivations. Śaṅkara constructs a graded ontology to guide aspirants from illusion to liberation, rooted in the soteriological imperative to realize Brahman, the non-dual ground of all being ^[1]. Kant, by contrast, delineates the limits of human knowledge through a critical epistemology that confines cognition to phenomena structured by a priori categories, while positing noumena as necessary boundaries of thought ^[2].