Everyone starts studies hoping to attain the spiritual world with the mind, like philosophers. However, a person gradually realizes that theoretical knowledge does not help, but rather stops him. It confuses him because he expects to achieve something by it.
We all have to go through this confusion, a stage of development, in which we try to understand the Creator through the mind; yet, we begin to grasp that neither the mind nor even feelings are intended for spiritual perception, that is, the true perception of reality. To do this, we need new sense organs.
Therefore, that part of desires and thoughts, the heart and mind, that was engaged in philosophical research is now freed from this occupation and can be dedicated to action. That is, a person really wants to change his desires and is willing to undergo surgery to have the stony heart cut out, turning it into the complete opposite.
He is ready to give himself to it, to have any changes made in him to the faith and devotion of the soul. He gives his soul to be changed qualitatively, and not in the mind. It is called that he becomes a hero, exits the nations of the world, and joins Israel.
From the 2nd part of the Daily Kabbalah Lesson 8/18/13, The Book of Zohar – Introduction