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The Thomistic Institute

The Natural Law Ethics of Killing – Prof. Christopher Tollefsen

The Thomistic Institute

The Thomistic Institute

Thomism, Society & Culture, Catholic Intellectual Tradition, Christianity, Religion & Spirituality, Catholic, Philosophy, Catholicism

4.8873 Ratings

🗓️ 5 February 2026

⏱️ 51 minutes

🧾️ Download transcript

Summary

Prof. Christopher Tollefsen argues from a Thomistic natural law perspective that it is always morally wrong to intend the death of an innocent human being, contending that this absolute norm binds both private individuals and public authorities alike.


This lecture was given on November 15th, 2025, at University of Florida


For more information on upcoming events, visit us at thomisticinstitute.org/upcoming-events.


About the Speakers:


Christopher Tollefsen is Professor of Philosophy at the University of South Carolina. He has published over 100 articles in journals and edited collections, and a similar number of popular essays in venues such as Public Discourse, First Things, and National Review.  He is the author of Lying and Christian Ethics and the forthcoming Killing and Christian Ethics, and is co-author of The Way of Medicine: Ethics and the Healing Profession (with Dr. Farr Curlin) and Embryo: A Defense of Human Life (with Robert P. George).  In 2019-20, he served as a Commissioner on the State Department’s Commission on Unalienable Rights.  He has twice been a Visiting Fellow in the James Madison Program at Princeton University, and in 2024-25 was a Visiting Fellow at the DeNicola Center for Ethics and Culture at the University of Notre Dame.


Keywords: ​Absolute Prohibition Of Killing, Augustine And Aquinas, Double Effect Principle, Ethics Of Self-Defense, Human Dignity And Life, Natural Law Theory, Public Authority And Violence, Thomistic Moral Theology, War And Capital Punishment

Transcript

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0:00.0

Welcome to the Tomistic Institute podcast.

0:06.2

Our mission is to promote the Catholic intellectual tradition in the university, the church, and the wider public square.

0:12.7

The lectures on this podcast are organized by university students at Temistic Institute chapters around the world.

0:19.0

To learn more and to attend these events, visit us at to mystic institute.org.

0:25.5

In 2011, I was involved in a controversy, when an academic tells you that they're

0:31.8

involved in a controversy that's kind of a cringe-making thing to say, right?

0:35.6

Very low scale.

0:36.8

But I was asked to write some things about whether I thought that it was morally permissible

0:42.5

for a particular pro-life group who had been engaged in some sting operations against

0:46.9

Planned Parenthood to be doing what they were doing.

0:49.4

And I argued that it was impermissible what they were doing because it involved lying. I argued that, I pointed

0:58.2

out, that lying had been considered intrinsically impermissible by St. Augustine, by St. Thomas

1:04.1

Aquinas, and this was also the common position of the natural law tradition and the Catholic

1:09.6

Church for at least a thousand years.

1:11.5

But it was clear at that time that the insights of Augustine and Aquinas had been lost.

1:16.5

And so I started to work on a book that eventually became lying in Christian ethics,

1:20.3

in which I argued that Augustine and Aquinas were in fact correct about lying.

1:24.7

If you understand lying as an assertion, an affirmation of something that's contrary

1:30.6

to what you believe, you affirm that something is true, contrary to what you actually

1:34.8

think is true, that's what a lie is, and I argued that this is always wrong.

1:39.5

Now in a review of that book, one academic said that he thought it was interesting that on the one hand

1:46.0

I was arguing for a recovery of Aquinas and Augustine's views online, but that on the other

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