This volume investigates the intellectual development and compositional history of John Henry Newman’s seminal philosophical work, A Grammar of Assent. The editor, Ian Ker, provides a comprehensive critical framework by analyzing Newman’s personal correspondence and diaries from 1868 to 1869. By synthesizing manuscript drafts, philosophical notebooks, and contemporary papers, the text establishes a rigorous context for understanding Newman’s arguments regarding belief and assent.

Scholars and theologians identify this volume as a definitive resource for understanding the nuances of Newman's later philosophical output. Readers frequently note the academic density of the prose and the meticulous nature of the editorial apparatus provided by Ker.