The author Johann Georg Hamann (1730-1788) from Königsberg was a dialogical thinker. He was inspired and challenged in diverse ways by contemporary literature, but his thoughts were also an inspiration and a challenge to his dialogue partners. This is reflected particularly in his correspondence with Kant, Herder, Jacobi, Lavater, Claudius and others. Hamann and his correspondents struggled with fundamental questions of human existence between the poles of everyday experience and wisdom, sensuality and reason. The contributions to this volume examine his correspondence from a literary, philosophical and theological perspective and offer insights not only to the work of Hamann, which is truly difficult to understand, but also to 18th-century epistolary culture.