Friedrich Spee's spiritual poetry book Trutznachtigall is considered one of the most significant testimonies of German poetry from the 17th century. This study aims to reveal the poetic texture of this work through central motifs and design strategies, and to determine its achievement at the intersection of poetry and theology. Intertextual interferences, narrative nesting, and hermeneutic impulses constantly engage the reader actively in the construction of meaning, while also highlighting the limits of their capacity for understanding. This reflects the mediating function of Trutznachtigall, which seeks to bring people closer to God, while simultaneously marking the distance to the numinous, thereby renewing the desire for the unattainable in a vibrant dynamic.