This lecture was given at Brown University on 18 October 2019.

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.

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