Menuchat HaNefesh, is also called Shabbat, the seventh day of rest. The intellect should rule over the heart. This is in a majority of cases. When the intellect breaks down, it is a sign that it is time to incorporate the heart and emotions into your life. The feelings are usually repressed.
People ignore their feelings.
They are afraid of their feelings. People live their whole life with intellect. The work of directing special souls to serve God from the heart with Menuchat HaNefesh belongs Torah Psychologists that know how to unite the heart and mind with God. Torah psychology is a very high level of knowledge. It includes the knowledge of Jewish Law, the knowledge of the soul acquired through meditation and prayer, and the knowledge of the Kaballah.