Geistliche Erquickstunden (Spiritual Hours of Refreshment)
Heinrich Müller (1631–1675) composed 300 house-and-table devotions in this collection, first published in Rostock in 1664–66, designed explicitly for domestic Lutheran piety and the ordered rhythms of household worship. Published where Müller served as both professor of theology and court-adjacent superintendent, the work gained immediate and wide popularity across the German Lutheran world, going through numerous editions within a generation. Müller occupied the transitional moment between Lutheran Orthodoxy and Pietism, combining Arndt-influenced warmth and affective directness with traditional Lutheran homiletical form, and his influence on Spener and early Pietism has been noted by historians. The short, self-contained format made it exceptionally practical for families, court chaplains, and individual readers without access to sustained devotional reading.