This work investigates whether Thomas Aquinas's central metaphysical doctrine regarding the nature of being is logically coherent or fundamentally flawed. Anthony Kenny, a prominent philosopher known for his work in both the history of philosophy and analytic tradition, applies rigorous logical scrutiny to Aquinas's ontological claims. He argues that the doctrine of being, as presented by Aquinas, contains systematic confusion that undermines the broader philosophical system, particularly the natural theology concerning the nature of God.

Scholars and students of medieval philosophy frequently note the technical density of Kenny's prose, which requires a foundational understanding of both scholastic terminology and analytic logic. Experts highlight this text as a significant, albeit provocative, critique that challenges traditional interpretations of Thomistic metaphysics.