“. . . the completeness of O’Rourke’s survey of the vast quantity of relevant (and often untranslated) text, as well as his extensive knowledge and prudent employment of the multilingual literature, make it a genuinely useful resource for scholars. . . Thus, because of its exhaustive historical scholarship, its even-handedness and its continued philosophical cogency, the reissue of O’Rourke’s book can be greeted with applause.” —Journal of Ecclesiastical History "The book's footnotes constitute a terrific, topically arranged guide to the primary sources." —Speculum "Although the argumentation of the book is subtle and profoundly conceived, it is stated with the most lucid and compelling clarity. The book was a labour of love and is certain to remain for many decades or more the standard work in an extraordinarily difficult area of the history of metaphysics." —International Journal of Philosophical Studies "A truly magnificent study." —Angelicum "The substantial and detailed analysis of the texts of both authors will prove an invaluable work of reference for students of Pseudo-Dionysius and Aquinas." —International Philosophical Quarterly "This is one of the two or three most important books on Aquinas published in the last fifty years." —Alasdair MacIntyre, University of Notre Dame