Abstract

The question of the unity of the soul is posed in the Midle Ages, at the crossing point of the Aristotelician theory, which distinguishes several potencies, even several parts in the soul, and the Augustinian doctrine, which underlines the unity of the mind using corporeal powers. John Buridan, when commenting the Treatise on the Soul of Aristotle, emphasizes the unity, probably in reaction against John of Jandun's position. From the middle of 14th century till the end of 17th, this problem goes on being debated through the two questions of the substantial unity of the soul and of the the relation between the soul and its potencies. This article studies some stages of this development, some of them immediately after Buridan, in Nicole Oresme's and Peter of Ailly's positions, another more distant, in Antoine Rubio's work. It suggests that we find still the same problematics, reelaborated and transformed, in Descartes.