* "Summa Theologica" - This comprehensive work of theology covers a wide range of subjects, including God, creation, angels, the sacraments, and the virtues. It is one of the most important works of medieval theology.
* "De Virtutibus et Vitiis" - This work explores the virtues and vices, providing practical guidance on living a moral life.
* "De Sacramentis" - This work examines the seven sacraments of the Catholic Church, explaining their nature, purpose, and significance.
* "Sermones de Tempore" - A collection of sermons for the various seasons of the liturgical year.
* "Sermones de Sanctis" - A collection of sermons on the saints.
He also wrote several other works on various theological and spiritual topics.
His writings are considered significant contributions to medieval theology and are still studied today. He was known for his clarity, depth, and practical insights into Christian teachings.