A Transcendental–Philosophical and Existential–Phenomenological Foundation of Sustainability on the Threshold of Theology

This article explores the foundations and scope of theological discourse on sustainability by drawing upon transcendental–philosophical and existential–phenomenological perspectives. This study addresses the ongoing debate regarding the unique contribution and place of theological appeals to sustainability, especially in relation to secular arguments and audiences. Building on the structures of human cognition, freedom, and meaning, as well as the phenomenological concepts of givenness and promise, this paper critically examines how these structures can both motivate sustainable behavior and serve as interfaces to theological creation and eschatology. The methodological approach combines systematic philosophical analysis with affirmative theology, especially reflecting on the interrelation between the cognitive and experiential dimensions of human existence. The findings suggest that sustainability is not merely a moral option promoted by extrinsic or intrinsic motivators but is deeply rooted in the anthropological groundings of the human being. This study argues that a philosophically and anthropologically grounded discourse on sustainability serves as a vital interface between religious conviction and secular reasoning, extending the reach and impact of sustainability ethics.