"This is a magnificent tour de force that engages head-on the attacks upon (and defence of) mental representationalism as the dominant epistemology of the modern period. . . this work constitutes the closest approximation currently available to a definitive 'map of the territory' of Anglo-American analytic epistemology, its fatal affiliation to the Cartesian theory of ideas, and a most persuasive argument for the distinctness of the Aristotelian-Thomist approach. . . splendid achievement. . ." —The Heythrop Journal
". . . an important and useful book. . . the book renders a valuable service from Thomistic resources to contemporary thinkers struggling with the perennial problems of realism. . ." —Theological Studies
". . . a helpful survey of claims and arguments, as well as the presentation of a certain approach to an interconnected set of problems." —The Philosophical Quarterly
“O’Callaghan offers an interpretation of Aquinas that is simultaneously traditional and innovative. [This] book undertakes a worthy effort to revitalize the traditional interpretation of Aquinas’s theory of cognition so that it can engage the contemporary debate about the relationship of language and thought to the world. His argument is timely. . . and it makes an important contribution to the field.” —The Thomist
“. . . this remarkable book will enlighten and delight all who are interested in the questions and the authors with whom it deals.” —Pro Ecclesia
"O'Callaghan writes as a passionate, penetrating, and faithful reader of St. Thomas. Thomists will have no difficulty recognizing the basic theses, but they will profit by following the careful development of these theses in dialogue with a number of contemporary philosophers." —Review of Metaphysics