'I Cannot Tell a Lie': Thomas Aquinas on the Moral Permissibility of Lying – Prof. Christopher Tomaszewski
The Thomistic Institute
The Thomistic Institute
4.8 • 873 Ratings
🗓️ 6 May 2026
⏱️ 52 minutes
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Summary
Prof. Christopher Tomaszewski argues that Thomas Aquinas teaches lying is intrinsically evil because it uses the faculty of speech against its natural purpose, even in difficult cases often thought to justify deception.
This lecture was given on March 19th, 2026, at University of Toronto.
For more information on upcoming events, visit us at thomisticinstitute.org/upcoming-events.
About the Speakers:
Christopher Tomaszewski is an Assistant Professor of Philosophy at Belmont Abbey College, where he teaches philosophy and great books. He holds a PhD in philosophy from Baylor University and a BS in mathematics from Villanova University. His primary research interests include metaphysics, mediæval philosophy, logic, and philosophy of religion (especially Thomistic solutions to contemporary problems in analytic philosophy), and more specifically in philosophical anthropology, classical theism, mereology, and causation. He is the author of several articles in Analysis, International Journal for Philosophy of Religion, Proceedings of the American Catholic Philosophical Association, and other journals. He lives near Charlotte, NC, with his wife Haley and their dog Borromeo.
Keywords: Aquinas, Assertion, Candor, Consequentialism, Intrinsic Evil, Lying, Natural Law, Perjury, Truthfulness, White Lies
Transcript
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| 0:23.6 | So we're going to talk tonight about the intrinsic evil of lying. This tends to get people |
| 0:29.6 | pretty excited and we'll talk about some of the fun cases toward the end of what I have |
| 0:36.6 | to say here. |
| 0:42.9 | But yeah, like I'll just open up by saying I'm going to defend like a really hard-line extremist, |
| 0:44.3 | homist position on this, right? |
| 0:45.3 | Like, you should never lie. |
| 0:48.2 | You shouldn't lie to your wife about how she looks in that dress. |
| 0:51.2 | You shouldn't lie to your children about Santa Claus. |
| 0:56.2 | You shouldn't lie to the Nazi at the door. yeah, I'm going to defend, I'm going to defend all of that, both in general and in particular. |
| 1:02.5 | And obviously, hopefully we'll have some fun in the Q&A about the hard cases, because I think |
| 1:08.1 | there are obviously hard cases, including some cases that I think |
| 1:11.6 | don't get very much attention but are actually what I consider to be the hardest cases. |
| 1:17.0 | I don't think the Santa Claus or Nazi cases are the hardest cases. I think something else |
| 1:23.4 | is the hard, potentially the hardest case. Okay, so we're doing philosophy. |
| 1:29.3 | Whenever we're doing philosophy, |
| 1:31.3 | first thing we definitely want to always make sure |
| 1:33.3 | we're doing is have a careful definition |
... |
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