The study is a first attempt to explore the so far almost unexplored speech about light in Meister Eckhart's vernecular sermons. Due to a consistent close reading of Meister Eckhart's vernacular sermons, the study elaborates the motif of light with reagrd to its significance for the history of tradition, as well as to its use for homiletic communication. Thus, it offers a sensitive perception of Eckhart as a theologian and thinker in the Christian world of the early 14th century.