"Das Eine" – was ist damit gemeint? Vierheit als strukturelle Antwort auf die säkulare Fragmentierung

This article revisits the classical philosophical question of unity by reconstructing its contemporary relevance under conditions of advanced social differentiation and secularization. Beginning with Parmenides, it shows that the ontological recognition of real difference has always carried the risk of fragmentation. While Parmenides responded to this risk by ontologically disqualifying difference and accepting the illusory status of the world, modern societies have taken the opposite path: they affirm difference without being able to relate it to a co-present form of unity.The article argues that contemporary fragmentation is not a contingent pathology but the structural consequence of a differentiation process lacking a binding reference to unity. To address this problem, it develops an operator-based fourfold model in which unity is conceived not as an origin, synthesis, or transcendent principle, but as a co-present structural condition that renders difference bearable. Drawing on the fourfold architectures of Peter Sloterdijk, Graham Harman, and Prabhat Ranjan Sarkar, the article shows how fourfold structures overcome the limitations of monism, dualism, and trinitarian mediation by stabilizing tension rather than resolving it.Special attention is given to secular societies, in which unity can no longer be guaranteed by transcendent authority. Here, trinitarian models become structurally decoupled and therefore functionally ineffective. The fourfold emerges as the minimal architecture capable of maintaining cohesion without redemption, synthesis, or metaphysical closure. Unity, the article concludes, is not believed in but built: it is a formal condition that allows difference to persist without collapsing into fragmentation.