Abstract
In Cartesian philosophy the study of emotion has great importance, because its only existence constitutes a real problem. In fact, through the passions, Descartes is located in front of the obscure and confused perceptions that, despite their not intellectual evidence, appear as manifestations of a third idea: the substantial union between res extensa and res cogitans.
What is the type of evidence that underpin passions? How can you reach this evidence? These are some of the questions that the author tries to answer.