Sadler's Lectures
by Lectures on classic and contemporary philosophical texts and thinkers by Gregory B. Sadler
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David Hume, Treatise of Human Nature - Identity And Relations Of Parts - Sadler's Lectures
Jun 24, 2026
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David Hume, Treatise of Human Nature - The Self As Bundle Of Perceptions - Sadler's Lectures
Jun 22, 2026
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Thomas Nagel, What Is It Like To Be A Bat? - Nagel's Speculative Proposal
Jun 21, 2026
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Thomas Nagel, What Is It Like To Be A Bat? - Deceptive Clarity In Identification - Sadler's Lectures
Jun 20, 2026
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Thomas Nagel, What Is It Like To Be A Bat? - Objective Understanding And Experience
Jun 19, 2026
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| Date | Episode | Topics | Guests | Brands | Places | Keywords | Sponsor | Length | |
|---|---|---|---|---|---|---|---|---|---|
| 6/24/26 | ![]() David Hume, Treatise of Human Nature - Identity And Relations Of Parts - Sadler's Lectures | This lecture discusses key ideas from the 18th century philosopher, essayist, and historian, David Hume's work A Treatise of Human Nature Specifically it examines what our conception of identity is for various objects over time, which Hume thinks is actually a fiction created by our own mind out of our perceptions, associating them in relation to each other in terms of resemblance, contiguity, and causation. With various objects we may focus on the proportion of changing parts to a whole, the reference of those parts to some common end or purpose, or on the sympathy of parts in mutual cause and effect. To support my ongoing work, go to my Patreon site - www.patreon.com/sadler If you'd like to make a direct contribution, you can do so here - www.paypal.me/ReasonIO - or at BuyMeACoffee - www.buymeacoffee.com/A4quYdWoM You can find over 4500 philosophy videos in my main YouTube channel - www.youtube.com/user/gbisadler Purchase David Hume's A Treatise of Human Nature - amzn.to/2V0QWxC | — | ||||||
| 6/22/26 | ![]() David Hume, Treatise of Human Nature - The Self As Bundle Of Perceptions - Sadler's Lectures | This lecture discusses key ideas from the 18th century philosopher, essayist, and historian, David Hume's work A Treatise of Human Nature Specifically it examines his argument that there is no such thing as a human self in a metaphysical sense of a substance or soul that remains the same throughout changes. Instead, what we have or are is a bundle or collection of perceptions in the mind. While we can form an idea of the self, this is essentially a fiction. To support my ongoing work, go to my Patreon site - www.patreon.com/sadler If you'd like to make a direct contribution, you can do so here - www.paypal.me/ReasonIO - or at BuyMeACoffee - www.buymeacoffee.com/A4quYdWoM You can find over 4500 philosophy videos in my main YouTube channel - www.youtube.com/user/gbisadler Purchase David Hume's A Treatise of Human Nature - amzn.to/2V0QWxC | — | ||||||
| 6/21/26 | ![]() Thomas Nagel, What Is It Like To Be A Bat? - Nagel's Speculative Proposal | This lecture discusses the 20th century Analytic philosopher, Thomas Nagel's essay "What Is It Like To Be A Bat", and focuses upon the "speculative proposal" Nagel ends the article with, namely that of developing a more objective "phenomenology" which would perhaps allow greater clarity and precision to be given to descriptions of the experiences of "what it is like to be a . . . " To support my ongoing work, go to my Patreon site - www.patreon.com/sadler or Buy Me A Coffee - https://buymeacoffee.com/a4quydwom If you'd like to make a direct contribution, you can do so here - www.paypal.me/ReasonIO You can find over 4,000 philosophy videos in my main YouTube channel - www.youtube.com/user/gbisadler Get Nagel's What Is It Like to Be a Bat? - https://amzn.to/3P8ihhk | — | ||||||
| 6/20/26 | ![]() Thomas Nagel, What Is It Like To Be A Bat? - Deceptive Clarity In Identification - Sadler's Lectures | This lecture discusses the 20th century Analytic philosopher, Thomas Nagel's essay "What Is It Like To Be A Bat", and focuses upon one of the key points Nagel makes in his criticisms of reductionist projects aimed at explaining mind entirely in physical terms, namely that in order to make the deceptively clear "is" or "are" involved in those putative identifications make sense, what is required is some sort of coherent and robust theoretical scheme explaining how the mental can be reduced to the physical. At the present time, that simply isn't available to us, so those sorts of identifications amount to hand-waving. To support my ongoing work, go to my Patreon site - www.patreon.com/sadler or Buy Me A Coffee - https://buymeacoffee.com/a4quydwom If you'd like to make a direct contribution, you can do so here - www.paypal.me/ReasonIO You can find over 4,000 philosophy videos in my main YouTube channel - www.youtube.com/user/gbisadler Get Nagel's What Is It Like to Be a Bat? - https://amzn.to/3P8ihhk | — | ||||||
| 6/19/26 | ![]() Thomas Nagel, What Is It Like To Be A Bat? - Objective Understanding And Experience | This lecture discusses the 20th century Analytic philosopher, Thomas Nagel's essay "What Is It Like To Be A Bat", and focuses upon Nagel's analysis of one way that a person who acknowledges that we cannot imagine or conceptualize the subjective experience of a bat might try to get around that, by appealing to more objective concepts and facts about the organs, body, and brain of the bat. He notes that this doesn't yield us the subjective experience and we are not even sure how to correlate the subjective and objective characters of matters like this, including how the human mind is supposed to be connected with or reducible to the human brain. To support my ongoing work, go to my Patreon site - www.patreon.com/sadler or Buy Me A Coffee - https://buymeacoffee.com/a4quydwom If you'd like to make a direct contribution, you can do so here - www.paypal.me/ReasonIO You can find over 4,000 philosophy videos in my main YouTube channel - www.youtube.com/user/gbisadler Get Nagel's What Is It Like to Be a Bat? - https://amzn.to/3P8ihhk | — | ||||||
| 6/16/26 | ![]() Thomas Nagel, What Is It Like To Be A Bat? - Subjective Experiences Of Other Species | This lecture discusses the 20th century Analytic philosopher, Thomas Nagel's essay "What Is It Like To Be A Bat", and focuses upon he portion of his article in which he begins to explore what subjective experience of other species would be and whether we have the capacity to imagine or understand what it is like to be to be that animal. He selects bats in particular since they are mammals but have a very different sensorium from us, in that they rely upon echolocation and have weak eyesight. To support my ongoing work, go to my Patreon site - www.patreon.com/sadler or Buy Me A Coffee - https://buymeacoffee.com/a4quydwom If you'd like to make a direct contribution, you can do so here - www.paypal.me/ReasonIO You can find over 4,000 philosophy videos in my main YouTube channel - www.youtube.com/user/gbisadler Get Nagel's What Is It Like to Be a Bat? - https://amzn.to/3P8ihhk | — | ||||||
| 6/15/26 | ![]() Thomas Nagel, What Is It Like To Be A Bat? - Reductionist Accounts And Conscious Experience | This lecture discusses the 20th century Analytic philosopher, Thomas Nagel's essay "What Is It Like To Be A Bat", and focuses upon the first part of the article, in which Nagel raises a number of general problems for adopting a physicalist reductionist analysis of mind to resolve the mind-body problem by explaining conscious experience in terms of something non-mental, e.g. the brain. To support my ongoing work, go to my Patreon site - www.patreon.com/sadler or Buy Me A Coffee - https://buymeacoffee.com/a4quydwom If you'd like to make a direct contribution, you can do so here - www.paypal.me/ReasonIO You can find over 4,000 philosophy videos in my main YouTube channel - www.youtube.com/user/gbisadler Get Nagel's What Is It Like to Be a Bat? - https://amzn.to/3P8ihhk | — | ||||||
| 6/12/26 | ![]() Thomas Hobbes, De Corpore - "Of Identity And Difference" - Sadler's Lectures✨ | identityphilosophy+4 | — | PatreonYouTube+4 | — | Thomas HobbesDe Corpore+5 | — | 10m 02s | |
| 6/10/26 | ![]() Stanislaw Lem, Summa Technologiae - Defrosting And Duplicating - Sadler's Lectures✨ | philosophythought experiments+5 | — | Summa Technologiae | — | Stanislaw LemSumma Technologiae+5 | — | 10m 03s | |
| 6/9/26 | ![]() Stanislaw Lem, Summa Technologiae - Killing the Telegraphed Person - Sadler's Lectures✨ | philosophythought experiments+4 | — | Summa Technologiae | — | Stanislaw LemSumma Technologiae+6 | — | 13m 58s | |
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| 6/7/26 | ![]() Stanislaw Lem, Summa Technologiae - Paradoxes Of Telegraphing Persons - Sadler's Lectures✨ | teleportationinformation theory+4 | — | Summa Technologiae | — | telegraphingtransporting+5 | — | 12m 46s | |
| 6/4/26 | ![]() William Clifford, The Ethics Of Belief - The Limits Of Inference - Sadler's Lectures✨ | ethics of beliefinference+3 | — | The Ethics Of Belief | — | William Cliffordethics of belief+5 | — | 14m 00s | |
| 5/30/26 | ![]() William Clifford, The Ethics Of Belief - Beliefs and Traditions - Sadler's Lectures✨ | ethics of belieftradition+3 | — | PatreonYouTube+2 | — | William CliffordThe Ethics Of Belief+3 | — | 14m 40s | |
| 5/28/26 | ![]() William Clifford, The Ethics Of Belief - Veracity, Knowledge, and Judgement - Sadler's Lectures✨ | ethics of beliefveracity+4 | — | PatreonYouTube+2 | — | William CliffordThe Ethics Of Belief+5 | — | 15m 29s | |
| 5/26/26 | ![]() William Clifford, The Ethics Of Belief - Individuals' Beliefs, Society, And Humanity✨ | ethics of beliefphilosophy+4 | — | PatreonYouTube+2 | — | William CliffordThe Ethics Of Belief+5 | — | 14m 23s | |
| 5/25/26 | ![]() William Clifford, The Ethics Of Belief - Belief, Action, and Duty Of Inquiry - Sadler's Lectures✨ | ethics of beliefevidence+3 | — | PatreonYouTube+2 | — | William CliffordThe Ethics Of Belief+3 | — | 14m 00s | |
| 5/23/26 | ![]() Seneca, Letter 90 - Philosophy, Technology, And Wisdom - Sadler's Lectures✨ | StoicismPhilosophy+4 | — | Seneca's LettersYouTube | — | SenecaPosidonius+5 | — | 20m 04s | |
| 5/22/26 | ![]() William Gass, The Case Of The Obliging Stranger - Moral Philosophers & Principles | This lecture discusses key ideas from the 20th century philosopher and novelist William Gass' article "The Case Of The Obliging Stranger", which begins with a case that runs: "Imagine I approach a stranger on the street and say to him, "If you please, sir, I desire to perform an experiment with your aid." The stranger is obliging, and I lead him away. In a dark place conveniently by, I strike his head with the broad of an axe and cart him home. I place him, buttered and trussed, in an ample electric oven. The thermostat reads 4500 F. Thereupon I go off to play poker with friends and forget all about the obliging stranger in the stove. When I return, I realize I have overbaked my specimen, and the experiment, alas, is ruined. Something has been done wrong. Or something wrong has been done" It focuses specifically on the applicability of moral theories and principles to deciding cases, whether clear or unclear, in our moral decision-making. Gass' view is that both are less useful than ethicists and even some ordinary people make them out to be. To support my ongoing work, go to my Patreon site - www.patreon.com/sadler If you'd like to make a direct contribution, you can do so here - www.paypal.me/ReasonIO - or at BuyMeACoffee - www.buymeacoffee.com/A4quYdWoM You can find over 3500 philosophy videos in my main YouTube channel - www.youtube.com/user/gbisadler | — | ||||||
| 5/20/26 | ![]() William Gass, The Case Of The Obliging Stranger - Clear Cases And Unclear Cases - Sadler's Lectures | This lecture discusses key ideas from the 20th century philosopher and novelist William Gass' article "The Case Of The Obliging Stranger", which begins with a case that runs: "Imagine I approach a stranger on the street and say to him, "If you please, sir, I desire to perform an experiment with your aid." The stranger is obliging, and I lead him away. In a dark place conveniently by, I strike his head with the broad of an axe and cart him home. I place him, buttered and trussed, in an ample electric oven. The thermostat reads 4500 F. Thereupon I go off to play poker with friends and forget all about the obliging stranger in the stove. When I return, I realize I have overbaked my specimen, and the experiment, alas, is ruined. Something has been done wrong. Or something wrong has been done" It focuses specifically on his distinction between what he terms "clear cases" and "unclear cases". With clear cases, like that of the obliging stranger, their rightness or wrongness, goodness or badness should be clear to anyone looking at them, and we don't need moral theories in order to make those judgements. With unclear cases, we have differing ways to try to make them more clear, but surprisingly, according to Gass, moral theories turn out not to be helpful in the ways that we expect them to in those cases either. To support my ongoing work, go to my Patreon site - www.patreon.com/sadler If you'd like to make a direct contribution, you can do so here - www.paypal.me/ReasonIO - or at BuyMeACoffee - www.buymeacoffee.com/A4quYdWoM You can find over 3500 philosophy videos in my main YouTube channel - www.youtube.com/user/gbisadler | — | ||||||
| 5/19/26 | ![]() William Gass, The Case Of The Obliging Stranger - The Case and Moral Theories - Sadler's Lectures | This lecture discusses key ideas from the 20th century philosopher and novelist William Gass' article "The Case Of The Obliging Stranger", which begins with a case that runs: "Imagine I approach a stranger on the street and say to him, "If you please, sir, I desire to perform an experiment with your aid." The stranger is obliging, and I lead him away. In a dark place conveniently by, I strike his head with the broad of an axe and cart him home. I place him, buttered and trussed, in an ample electric oven. The thermostat reads 4500 F. Thereupon I go off to play poker with friends and forget all about the obliging stranger in the stove. When I return, I realize I have overbaked my specimen, and the experiment, alas, is ruined. Something has been done wrong. Or something wrong has been done" It focuses specifically on Gass' contentions that moral theories and moral philosophers who don't condemn what was done to the stranger are vicious, and that the wrong is not really clarified well by introducing moral theories and principles. He examines several different ways that people develop, articulate, and argue for their moral theories, and notes that they aren't entirely off-base or useless, but that they often get in the way with what he calls "clear cases". To support my ongoing work, go to my Patreon site - www.patreon.com/sadler If you'd like to make a direct contribution, you can do so here - www.paypal.me/ReasonIO - or at BuyMeACoffee - www.buymeacoffee.com/A4quYdWoM You can find over 3500 philosophy videos in my main YouTube channel - www.youtube.com/user/gbisadler | — | ||||||
| 5/17/26 | ![]() Aristotle, On Interpretation - Contraries Of Affirmative Propositions - Sadler's Lectures | This lecture discusses the ancient Greek philosopher Aristotle' work, On Interpretation, focusing on his discussion near the end of the work bearing on what the contraries of affirmative, generally universal, proposition, actually are, since this is an issue that people often get confused over. Aristotle will resolve this partly by considering in propositions what is the case by essence (kath'heato), or accidentally (kata sumbebēkos). To support my ongoing work, go to my Patreon site - www.patreon.com/sadler If you'd like to make a direct contribution, you can do so here - www.paypal.me/ReasonIO You can find over 4,000 philosophy videos in my main YouTube channel - www.youtube.com/user/gbisadler Purchase Aristotle's On Interpretation - amzn.to/3nS55ud | — | ||||||
| 5/16/26 | ![]() Aristotle, On Interpretation - Distinctions Among Potentialities - Sadler's Lectures | This lecture discusses the ancient Greek philosopher Aristotle' work, On Interpretation, focusing on his discussion of different ways in which something can be potential (dunamis) or possible (dunaton), terms that have multiple senses and are thus ambiguous. He distinguishes between rational and irrational possibilities, a difference which gets used by many later authors. He clarifies ways that potentiality or possibilities can be related to the actual or things in activity, and to what is necessary as well. To support my ongoing work, go to my Patreon site - www.patreon.com/sadler If you'd like to make a direct contribution, you can do so here - www.paypal.me/ReasonIO You can find over 4,000 philosophy videos in my main YouTube channel - www.youtube.com/user/gbisadler Purchase Aristotle's On Interpretation - amzn.to/3nS55ud | — | ||||||
| 5/15/26 | ![]() Aristotle, On Interpretation - Necessity, Contradictories, and Contraries - Sadler's Lectures | This lecture discusses the ancient Greek philosopher Aristotle' work, On Interpretation, focusing on his discussion of modal propositions that include or reference necessity. He notes that there is an inverse relation between necessity and impossibility, that with necessity, contraries follow upon contradictories, and that possibility follows from necessity but not the converse. To support my ongoing work, go to my Patreon site - www.patreon.com/sadler If you'd like to make a direct contribution, you can do so here - www.paypal.me/ReasonIO You can find over 4,000 philosophy videos in my main YouTube channel - www.youtube.com/user/gbisadler Purchase Aristotle's On Interpretation - amzn.to/3nS55ud | — | ||||||
| 5/12/26 | ![]() Aristotle, On Interpretation - Implications Of Modal Propositions - Sadler's Lectures | This lecture discusses the ancient Greek philosopher Aristotle' work, On Interpretation, focusing on his discussion of what the implications of modal propositions are, that is, propositions that bear upon possibility, contingency, impossibility, and necessity. He identifies propositions of these sorts that imply each other. To support my ongoing work, go to my Patreon site - www.patreon.com/sadler If you'd like to make a direct contribution, you can do so here - www.paypal.me/ReasonIO You can find over 4,000 philosophy videos in my main YouTube channel - www.youtube.com/user/gbisadler Purchase Aristotle's On Interpretation - amzn.to/3nS55ud | — | ||||||
| 5/11/26 | ![]() Aristotle, On Interpretation - Possible, Contingent, Impossible, Necessary - Sadler's Lectures | This lecture discusses the ancient Greek philosopher Aristotle' work, On Interpretation, focusing on his discussion of modal terms such as possible (dunaton), contingent (endekhomenon), impossible (adunaton), and necessary (anankhaion) as they are used in propositions, where affirmations or negations possess truth or falsity. He also discusses what real and mistaken contradictions of these types of propositions are. To support my ongoing work, go to my Patreon site - www.patreon.com/sadler If you'd like to make a direct contribution, you can do so here - www.paypal.me/ReasonIO You can find over 4,000 philosophy videos in my main YouTube channel - www.youtube.com/user/gbisadler Purchase Aristotle's On Interpretation - amzn.to/3nS55ud | — | ||||||
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