Talmud Eser Sefirot, Part 1, “Table of Questions and Answers for the Meaning of the Words,” Question 43: What is separation?
Two degrees without any Hishtavut Tzura [equivalence of form] on any side are regarded as completely separated from one another.
Our desires are like two circles: They can coincide completely, superimposing on each other and thus becoming one circle. Or they can overlap and be partially one inside the other. Or they can come in contact with one another with one point, their common desire.
Total separation means that we don’t have a single common quality or desire. That is to say, the first is not similar to the second in any way and we do not attain any form of bestowal with one another that would allow us to be one inside the other.
If I don’t take a single desire from you in order to bestow to you, and you don’t take a single desire from me in order to bestow to me, then we do not touch each other and are completely separated.
If at least one desire to bestow to one another appears between us, then there is already contact between us. And if there are several desires like that, then we are already partially one inside the other: I am inside your desires and you are inside mine.
That is how we advance until you take my desires and I take all of yours, and through them we bestow to one another: I give everything to you and you – to me. This is called adhesion.
These definitions from Talmud Eser Sefirot are unusually important. Memorize them mechanically, because that is useful as well. Later, by perceiving them on the level of feelings and intellect, try to gradually unite the mind and the feeling.
From the 3rd part of the Daily Kabbalah Lesson 6/27/11, Talmud Eser Sefirot