Answer: The heart is all of a person’s desires. When a person discovers that all these desires are for the sake of self-gratification, he sees that they are broken.
What is the breaking? Once upon a time, initially, they were connected by the force of bestowal, the force of connection among them. This happened naturally due to the Light or awakening from Above since that is what the Creator created.
Then the Creator concealed Himself and the Light disappeared. For this reason the connection among them disappeared. The revelation of a lack of connection among us is called breaking. All of this is talking about the creatures.
The absence of the revelation of the Creator or the quality of bestowal caused disunity. This disunity may be felt the way we now feel: “It’s not so bad. Everything’s OK. I just wish others would stop bothering me, and I also won’t harm anyone.” This is called the revelation of the breaking.
Besides this, there is a state where we feel that we are in the state of breaking and there is no connection or unity among us. This can also involve varying degrees of the realization of evil: Without a connection among us, I will not attain a good material life; or through the absence of connection among us, I bring about natural disasters; or due to the absence of this connection, I do not attain the Creator, spirituality.
In other words, it is possible for a revelation to happen above the exile (meaning the lack of connection among us), or it is possible for a revelation to happen from below, which is what humanity is now gradually attaining.
From the 2nd part of the Daily Kabbalah Lesson 8/15/10, The Zohar