Before revision: In the treatise Passions of the Soul (), the last of Descartes' published works, completed in 1649 and dedicated to Queen Christina of Sweden, the author contributes to a long tradition of theorizing "the passions".
After revision: In his final philosophical treatise, The Passions of the Soul (), the last of Descartes' published works, completed in 1649 and dedicated to Queen Christina of Sweden, René Descartes contributes to a long tradition of philosophical enquiry into the nature of "the passions".