The Passions of the Soul by René Descartes is a philosophical treatise written in 1649. In this work, Descartes examines the nature of the emotions and their effects on the human mind. He argues that the passions are the result of the interaction between the soul and
From Wikipedia
In his final philosophical treatise, The Passions of the Soul, completed in 1649 and dedicated to Princess Elisabeth of Bohemia, the French philosopher and mathematician René Descartes contributes to a long tradition of philosophical inquiry into the nature of "the passions". The passions were experiences – now commonly called emotions in the modern period – that had been a subject of debate among philosophers and theologians since the time of Plato.