Answer: Internal Light is the light that enters me. The Surrounding Light is the light I am aware of, aware that it exists but don’t clearly feel like a person who can comprehend what is going on. A person feels as if he were in the twilight zone where he cannot recognize a familiar image or distinguish a friend from a stranger. (A friend is the desire attached to you, and a stranger is the desire you can’t work with; yet, specifically from these states, later, we gain the opportunity for correction.)
During the day, nothing needs to be done; everything is already clear. At night, there isn’t much to do either since I can’t see anything. Both of these states have been discerned, but it is the “evening” which gives an opportunity for work, a place where desires can blend (“Erev” – evening derives from the word “Eruv” – blending).
After the breaking, all desires blended with each other, but when some part of these broken desires falls into the state of evening and reaches us, we can discern and attach them to the “day.” In this manner, we gradually study our desires. Therefore, the major discernments occur at the border between the Internal and Surrounding Light.
From the 3rd part of the Daily Kabbalah Lesson 10/26/10, “Beit Shaar Ha-Kavanot”
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