The first volume of the middle part (Media Quinquagena) of Augustine's Enarrationes in Psalmos contains the explanations of psalms 51-60, which are directly based on sermons taken down in shorthand. In this volume there are some of Augustine's most extensive and rhetorically interesting psalm sermons. In constituting the text, special attention was paid to the adequate reconstruction and presentation of Augustine's colourful oral style. Besides, the editor attempted to reconstruct the exact wording of Augustine's psalm text, which is presented in separate preliminary chapters.