Fr. T.J. White, a theologian specializing in metaphysics, discusses Thomas Aquinas' metaphysics. Topics include form and matter, substance and accidents, principles as constitutive causes, and the distinction between ontological structure and intellectual understanding. The podcast explores formal nature, the enduring influence of form in determining reality, and the role of form and matter in natural realities over time. It also delves into substance, properties, and the concept of substance as an individual with defined nature.