The chapter examines the role of reason in relation to reality, understood as comprising both the objective structure of existence—extending beyond material form—and its subjective apprehension, which depends upon reason: its products, methods, and attitude. As the mediator between the noematic coreNoemanoematic core of the human being and external world, reason integrates elements of both domains, allowing for systematic analysis. On this basis, four layers of realityRealitylayers of reality are distinguished: surface realityRealitysurface reality, mediative realityRealitymediative reality, essential realityRealityessential reality, and objective realityRealityobjective reality. These layers illuminate the diverse manifestations of a single underlying truth. The chapter further classifies human experience—conceived as the communicative space between consciousness and reality—into three principal modes: life experienceExperiencelife experience, scientific experienceExperiencescientific experience, and spiritual experienceExperiencespiritual experience. This framework highlights how the potential of rational consciousnessConsciousnessrational consciousness is realized when it evaluates the adequacy of reason in expressing its intentionalityIntentionality. In dialogue with HeideggerHeidegger Martin’s thought, the chapter finally addresses the center of reason—its guiding idea and power of intentionalityIntentionality—as the principle distinguishing ontological from merely ontic beingOntic being. It explores the human capacity to penetrate to the essence of objects, to recognize reality in its depth, and to identity the markers of authentic being.