This essay deals with the ‘Eucharistic Mirror Comparison’ in the spiritual literature of the Middle Ages. The miracle that the body of Christ is entirely present in each individual host and yet remains undivided is here captured in the image of abroken mirror. We analyse a series of texts consisting of late medieval and early modern Middle High German treatises, sermons and didactic dialogues, as well as Konrad von Würzburg’s Goldene Schmiede,regarding the use of this comparison and its functionalisation.