Why Can’t We Feel The Stony Heart?

Question: Why can’t we feel the stony heart?

Answer: It is possible to feel the stony heart, but it is impossible to work with it because it cannot be changed in any way. You see a desire in yourself, a quality that is unshakable like a rock, and you cannot do anything with it.

You begin to work with it, wrap it into something, try to connect it to something, blast it, shower it, grind it like in a concrete mixer, and then you see again that this is the same rock, the same egoism.
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From the Kabbalah Lesson in Russian 5/14/17