Descartes Reboots Everything — Descartes to Nietzsche (Lecture 1)

Lecture 1 of "From Descartes to Nietzsche: The Birth of Science and the Death of God." Watch the full lecture series:    • From Descartes to Nietzsche: The Birth of ...   Presented by Ergo, a nonprofit that publishes structured philosophical lectures online, free to anyone. https://ergo.org About this lecture What happens when a brilliant thinker decides to tear down everything he believes in order to rebuild knowledge from scratch? In this lecture, Lee Braver guides you through Descartes' *Meditations on First Philosophy*, one of the most consequential texts in Western intellectual history. Beginning with the famous night in 1619 when Descartes resolved to transform how we acquire knowledge, Braver explains why Descartes was so dissatisfied with the education of his era: it produced no practical benefits, no medicine, no technology to improve human life. The lecture then unpacks Descartes' revolutionary strategy of methodological doubt, systematically attacking every category of belief, from empirical observations to mathematical truths, searching for anything that survives the most extreme skeptical scenarios imaginable. Braver illuminates how this process leads Descartes to his famous indubitable foundation, the certainty of his own existence as a thinking thing, and explores the deeper question of what it means to know not just that you exist, but what you are. About this course Lee Braver leads a tour through four of the most influential philosophers in Western history, asking a single question: how do we know anything at all? Beginning with Descartes, who rebuilt knowledge from scratch, the course follows Hume's challenge to cause and effect, Kant's claim that our minds shape the world we experience, and Nietzsche's confrontation with a universe drained of meaning. Across seven lectures, this introductory course traces one unfolding argument about truth, knowledge, meaning, and human freedom, showing how each thinker built on and challenged those before. About Lee Braver Lee Braver is a Courtesy Professor of Philosophy at the University of South Florida, where he was a Professor of Philosophy from 2012 to 2025. His interests include continental philosophy, especially Heidegger and Foucault, Wittgenstein, realism, and dialogue between continental and analytic philosophy. He is the author of A Thing of This World: A History of Continental Anti-Realism, Groundless Grounds: A Study of Wittgenstein and Heidegger, and Heidegger: Thinking of Being, and editor of Division III of Being and Time: Heidegger's Unanswered Question of Being. Chapters 00:00 Introduction to the Meditations on First Philosophy 00:35 Why Existing Knowledge Had to Be Scrapped 02:29 When Science Didn't Exist Yet 04:42 Believing Is Seeing: Why Observation Fails 08:41 Getting the Worldview Right First 10:58 The Foundation: Beliefs That Cannot Be False 13:08 How the Meditations Are Written 14:20 Testing Beliefs Like Bulletproof Material 16:44 Methodological Doubt and Grouping Beliefs 18:50 Can We Trust Our Senses? 24:00 The Dream Argument Destroys All Perception 26:14 Math and Logic Beyond the Senses 28:40 The Evil Demon: Nuclear Bomb of Doubt 31:18 I Think, Therefore I Am 36:24 Existence vs. Essence: What Am I? 40:11 Cartesian Dualism: Minds and Bodies 41:17 The Third Foundation Stone: Ideas Exist