AgoraAn open square of thought

Work · Medieval & Scholastic

On the Unity of the Intellect against the Averroists

1270 · by Thomas Aquinas

Each individual human being thinks: against the doctrine of a single intellect.

Open in the star map

Introduction

Thomas wrote this short polemical treatise in Paris in 1270, against masters of the arts faculty, among them Siger of Brabant, who followed Averroes in teaching a single intellect for all humans. Most of the five chapters argue from Aristotle’s text and from Greek and Arabic commentators that Averroes misread Aristotle. The key philosophical point is that it is the individual human being who thinks: if thought did not belong to the individual, no one could be said to know anything. The treatise ends with a challenge to answer in writing, not “in corners” or “before boys”. In December 1270 the bishop of Paris, Étienne Tempier, condemned thirteen propositions, among them the unity of the intellect.

Connections

Criticizes

Answered in

Criticized in

More works by Thomas Aquinas

As of November 2026 · Improve this page · How Agora is made

Open in the star map