Few 13th-century thinkers still shape moral philosophy the way Thomas Aquinas does. If you’ve ever wondered what “natural law” actually means — beyond the courtroom or the campaign trail — Aquinas’s answer, written nearly 750 years ago, remains the most influential starting point. This article unpacks where his natural law doctrine sits in the Summa Theologiae, how he defined law itself, and what modern interpreters make of it all.

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Summa Theologiae: 1265/66–1273 ·
Aquinas’s

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Additional sources

newadvent.org, columbia.edu, isidore.co, aquinasonline.com, natural-law-and-conscience.org, britannica.com, avemarialaw.edu, thepublicdiscourse.com, britannica.com, theologyoflaw.org, plato.stanford.edu, britannica.com

For a fuller context on his life and the development of his thought, readers may consult a detailed biography of St Thomas Aquinas that covers his earlier works.