Key Moments
Reckoning with Parfit: A Conversation with David Edmonds (Episode #321)
Sam HarrisKey Moments
David Edmonds discusses Derek Parfit's philosophical work on identity, future people, and population ethics.
Key Insights
Derek Parfit was a highly influential 20th-century moral philosopher, known for his work on identity, time bias, and population ethics.
Parfit argued that personal identity over time is not based on an enduring essence but on psychological continuity.
The 'non-identity problem' highlights that our decisions about future policies affect *who* is born, not just the quality of life for existing individuals.
Population ethics grapples with obligations to future people and the consequences of different population sizes and well-being levels.
Parfit's 'Repugnant Conclusion' suggests that a vastly larger population with lives barely worth living could be better than a smaller population with very happy lives.
Parfit's philosophical approach, often consequentialist, led him to believe that consequences, rather than personal identity, are what ultimately matter.
INTRODUCTION TO DEREK PARFIT AND HIS PHILOSOPHICAL SIGNIFICANCE
David Edmonds joins Sam Harris to discuss the profound philosophical contributions of Derek Parfit, a philosopher whose work significantly shaped 20th-century thought, particularly in moral philosophy. Edmonds' recent book, 'Parfit: A Philosopher and His Mission to Save Morality,' delves into Parfit's life and ideas. Parfit is recognized by many, even his opponents, as one of the greatest moral philosophers, with some likening his impact to that of John Stuart Mill. His work is characterized by its intellectual rigor and unique approach, often seen as stemming from a highly individual, perhaps neuro-atypical, perspective.
PARFIT'S EARLY LIFE AND THE DEVELOPMENT OF HIS UNIQUE PHILOSOPHICAL STYLE
Edmonds recounts Parfit's rich early life, marked by diverse interests in history, music, and sports, contrasting it with his later intense focus on philosophy and photography. This shift, particularly his dedication to photographing the same cityscapes repeatedly, forms a central puzzle in Edmonds' biography. This intense focus, coupled with an atypical approach to philosophical problems, led Parfit to develop groundbreaking ideas but also created peculiar anecdotes, such as his intense, perfectionist approach to editing photographs and meticulously reviewing notes, sometimes with baffling results.
THE PHILOSOPHY OF PERSONAL IDENTITY
A cornerstone of Parfit's philosophy is his exploration of personal identity. He rejected the notion of an enduring 'essence' of a person, arguing instead that what matters is psychological continuity – the persistence of memories, beliefs, and dispositions over time. Through thought experiments like the teletransporter and brain hemisphere cases, Parfit argued that identity itself is less important than psychological continuity. This perspective has significant implications for how we view responsibility, the past, and the future, suggesting a closer connection to others and a more distant one to our past and future selves.
THE NON-IDENTITY PROBLEM AND OBLIGATIONS TO FUTURE PEOPLE
Parfit's 'non-identity problem' fundamentally challenges our intuitions about harm and responsibility concerning future generations. He argued that many policy decisions, such as those related to climate change or resource depletion, affect not *which* specific people exist, but *who* exists. If a policy leads to lives that are better than nothing, even if they are not ideal, it is difficult to claim that anyone has been harmed in the traditional sense. Yet, Parfit contended that we can still make moral judgments about these policies based on the overall well-being of the future populations they create.
POPULATION ETHICS AND THE REPUGNANT CONCLUSION
Building on his work on future people, Parfit developed the field of population ethics. A central, and deeply counter-intuitive, conclusion he reached is the 'Repugnant Conclusion.' This posits that for any population with a high average level of well-being, there exists a vastly larger population with a lower, barely worth-living, level of well-being, which is ethically better. Parfit himself found this conclusion disturbing and spent years trying to find a way around it, highlighting the complex moral trade-offs involved in decisions about population size and well-being.
TIME BIAS AND CONSEQUENTIALISM AS A UNIFYING THREAD
The conversation touches upon Parfit's fascination with time bias—our tendency to value future suffering less than past suffering, even if the experiences are identical. Parfit's philosophical journey, from personal identity to population ethics, consistently led him towards a consequentialist framework. He ultimately believed that the consequences of our actions and policies are what truly matter, advocating for choices that lead to better outcomes, whether for ourselves across time or for future generations. This emphasis on outcomes reflects a deep commitment to improving the overall state of the world, often drawing parallels to Buddhist philosophy.
Mentioned in This Episode
●Organizations
●Books
●Concepts
●People Referenced
Navigating Parfit's Philosophy: Key Concepts
Practical takeaways from this episode
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Common Questions
The non-identity problem, as articulated by Derek Parfit, questions the ethics of decisions that affect future people. It highlights that any choice we make about population policies or even minor actions will determine not just the quality of life for future individuals, but *who* specifically will exist, making it difficult to establish harm to a particular identifiable person.
Topics
Mentioned in this video
The author of the biography 'Parfit: A Philosopher and His Mission to Save Morality' and a writer, philosopher, and interviewer.
A philosopher whose work is used as a benchmark to assess Parfit's significance in moral philosophy.
Parfit's first PhD student, who is featured in an anecdote about Parfit's peculiar behavior with his photography.
A highly influential philosopher whose work on personal identity, future generations, and ethics is the central focus of the conversation. He is known for his work on the non-identity problem and the repugnant conclusion.
A philosopher mentioned in relation to an encounter with Wittgenstein.
The host of the Making Sense podcast and the interviewer. He expresses admiration for Derek Parfit's work.
A philosopher mentioned in relation to a famous encounter with Karl Popper and as another example of a potentially neuro-atypical philosopher.
A philosopher and Derek Parfit's wife, who was also a supervisor for David Edmonds.
The biographer of Ludwig Wittgenstein, mentioned in the context of discussing Wittgenstein's potential neuro-atypicality.
A book co-authored by David Edmonds about an encounter between philosophers Wittgenstein and Karl Popper.
Derek Parfit's seminal 1984 book, which covers personal identity, future generations, and population ethics, and is considered a masterpiece by many.
David Edmonds' recent book, a biography of Derek Parfit, which serves as the primary text for the conversation.
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