Unlike traditional Protestant theology that viewed the natural world in ambiguous and, at times, hostile ways, Paul Tillich's theology developed a complex relationship between God, man, and nature. Being and Earth recommends the application of Tillich's theology, which envisions a harmonious relationship with nature, as an "environmental ethic."Being and Earth recommends the application of Tillich's theology, which envisions a harmonious relationship with nature, as an "environmental ethic."