For metaphysicians who have imbibed the sober and inebriating teachings of Thomas Aquinas, existence is an act, the act which makes all things actually to be. As the act of existence makes things to be, essence makes them to be what they are. Essence and the act of existence, in other words, are really distinct yet together they compose each of the things that are.

Such an understanding involves a number of paradoxes, and Frederick D. Wilhelmsen's articulation of them reveals his philosophical genius. These paradoxes include the fact that the act of existence does not exist, that it...

The Metaphysics of Love develops the existential metaphysics of St. Thomas Aquinas, applying it to explore the ontological structure of the human person. Published first in 1962, this book demonstrates the fertility of Thomistic metaphysics and the enduring influence of Thomism on Western philosophy. It uncovers the ecstatic structure of human existence, in dialogue with philosophers ranging from Plato, Aristotle, and Aquinas, to Kant, Hegel, Heidegger, Tillich, Zubiri, and Ortega y Gassett, as well as theologians and historians Romano Guardini, Hilaire Belloc, and Eric...

Frederick D. Wilhelmsen's Being and Knowing, rooted in the philosophy of St. Thomas Aquinas, rests on two basic assertions: first, metaphysics is the science of being in its first and ultimate act, existence (the act by which all things manifest themselves); second, that existence is known not through observing objects, but in affirming through judgments that these objects are subjects of existence.

The chapters of this book explore these Thomistic doctrines. Some explain St. Thomas Aquinas's philosophy of being. Others probe his epistemology. The complexity and density of...