“For your crimes, your mother was sent away,” meaning repentance from both sides. The internality in Torah and Mitzvot [commandments] is called “your mother,” meaning she pours on us abundance, as is the nature of a mother who sustains her children.
The question is why do we not feel the internality of the abundance that is clothed in Torah and Mitzvot. The answer is that before a person is qualified to receive, meaning before he can receive in order to bestow, he is placed under the rule of the Tzimtzum [restriction], which is an empty place. Only through repentance, when one obtains the vessels of bestowal, one becomes fit to receive. At that time, the internality that is concealed in Torah and Mitzvot is revealed to him.
This is called “For your crimes, your mother was sent away,” through the sins that are governed by reception in order to receive. At that time, one must send and push away the internality in Torah and Mitzvot, and it is regarded as nonexistent.
When one repents, it is called “repentance from both sides”: 1) The lower to the upper, when one comes closer to the Creator and wants to bestow upon Him, 2) The upper to the lower, when the Creator is revealed to a person and it is considered that He returns Himself, after being far.