In order to attain The Zohar a person needs to open the channel that leads to the heart. And the tendency to understand it with the mind is given in order for us to resist this and wish for The Zohar to be revealed in the heart. Otherwise it will not work.
It is necessary to make an “opening in the heart” so that the text of The Book of Zohar is felt in inner attainments, in the desire, rather than just in the external mind where one connects words to each other. After all, the external picture which one imagines in the mind, remembering the meaning of words and building logical connections between them, does not allow him to constantly aspire to feel The Zohar.
Such an approach is doomed to fail. A person receives satisfaction from the fact that he seemingly connected a few things in his mind, and the problem is solved for him. He has no regret or desire left to feel and attain. He learns the external (comprehensible to him) definitions from the Book and builds a “Lego” out of them by connecting them to each other.
However, only under the condition that a person already feels what is written in The Zohar and wishes to connect the sensations, can he look at the words of the text and connect the sensations according to these words. If there are no sensations, it’s better not to activate the mind and just to wait for “the wonderful force” (Segula) that is contained in The Book of Zohar to affect you.
From the 2nd part of the Daily Kabbalah Lesson 8/11/10, The Zohar