Pushing the boundaries of thought and experience has continually challenged artists and philosophers since antiquity. Rainer Marten outlines three forms of the radicality of the spirit, exploring fundamental questions of human existence through philosophical, theological, and literary paths. The works of Heidegger, Paul, and Proust present three monumental designs in which phenomena such as life and death, happiness and time, faith and truth are sharply articulated. In the spirit of an enlightening, rather than disenchanted, understanding of what the spirit can achieve in its border crossings and transgressions, a dual poetry emerges: everything that philosophy and theology articulate as secured knowledge, captured reality, and justified truth possesses a poetic character. However, they seek to express this - once again through poetic means.