Apologia is a detailed autobiography in defense of Newman’s theological and ecclesiastical conclusions. Newman wrote this volume as a formal rebuttal to many negative claims and questions concerning his theology and conversion to Catholicism. By the fall of 1863, these allegations came to a head with the publication of some negative comments about Newman in the periodical Macmillan’s Magazine. In the article, Mr. Charles Kingsley accused (then) Father Newman of possessing a weakened understanding of the source and necessity of truth and subsequently defamed many central tenets of Catholicism. Newman and Kingsley maintained brief correspondence resulting in a formal retraction from Kingsley—all of which appear as the Foreword to the present publication. After the failed attempt at corresponding with Kingsley directly, Newman published this volume and was hailed as the defender of Catholic doctrine in England. Apologia, and the included correspondence, is an essential step to understanding the theology of John Henry Newman and the nineteenth century Catholic Church.