Why was Peter Abelard’s Theologia condemned at the Council of Soissons in 1121?

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Peter Abelard Peter Abelard, with Héloïse, miniature portrait by Jean de Meun, 14th century; in the Musee Conde, Chantilly, France.

At the Council of Soissons in 1121, Peter Abelard’s Theologia was formally condemned as heretical and subsequently burned. The primary reason for this condemnation was that his dialectical analysis of the mystery of God and the Trinity was considered erroneous by the council.1

Following this judgment, Abelard was placed under house arrest for a period at the abbey of Saint-Médard. This event marked an early instance of the friction between Abelard’s pioneering use of dialectics in theological inquiry and the traditional authorities of his time, who were often suspicious of applying secular philosophical methods to matters of faith.12