On the many letters that Elisabeth Queen of Bohemia wrote to Descartes she questions how dualism can have effect on the body and questions if the body and soul are really separate entities. On the letters Elisabeth describes how her emotional distress also has negative effects on her body. How depression although a state of mind can make her body feel tired and even be in pain. Although he agrees with the doctors in one occasion that Elisabeth’s fever can be cured with exercise and proper diet he mentions that for her to really feel better she needs to heal her soul. In letters that he sends later he also talks about passion that moment when body and mind become one and that Elisabeth has not felt. He describes how ones thoughts can control