This lecture was given on March 28th, 2023, at the University of Texas at Austin. For more information on upcoming events, please visit our website: thomisticinstitute.org/upcoming-events Speaker Bio: Alexander Pruss has doctorates both in philosophy and mathematics, and is currently Professor of Philosophy at Baylor University. His books include The Principle of Sufficient Reason: A Reassessment (Cambridge University Press), One Body: An Essay in Christian Sexual Ethics (Notre Dame University Press), and Actuality, Possibility and Worlds (Continuum). His research areas include metaphysics, philosophy of religion, Christian ethics, philosophy of mathematics and formal epistemology.