Why is it called “Gid HaNasheh”? Because it causes movement (“Menashe”); it moves people farther away from serving the Creator. And therein the evil inclination is instilled.
Here The Zohar explains which desires out of the sum total of our desires we can use, and which we cannot, as well as how to correct them and connect to them with one another. All these desires are egoistic, for the sake of self-enjoyment, and therefore, we have to place certain restrictions in effect when using them.
We can correct desires with Aviut (coarseness) below a certain level by using them for the sake of bestowal – that is, to receive for the sake of bestowal. As for desires with Aviut above that level, we can use them only by bestowing for the sake of bestowal.
Besides this, there are other desires that we mustn’t use at all, but only restrict them. The words “mustn’t” and “impossible” mean “unable to.” This is the only kind of prohibition that exists in the spiritual world.
However, because our desires are corrupted to begin with, as it is written: “I have created the evil inclination,” the first step on our path is exposing the evil. After that we advance by correcting our desires – by changing our intention of using them from “reception” to “bestowal,” from the easy to the difficult, from the simple to the complex.
The Zohar explains that we are given the change to reveal the full picture in every state; however, we can only reveal it to a small degree, as if it were compressed, as if we are zooming in on it. Therefore, in every state we have all the desires, the complete soul. In other words, the same World of Infinity is continually being shown to us at a different measure or resolution.
But whatever the case, we must discern every desire in every state. Therefore, although we haven’t yet attained the state of being able to correct great, lofty, and special desires, nevertheless by reading about these desires, which haven’t yet been revealed to us in our individual spiritual work, we awaken the Lights at those levels, and these Lights in turn correct us.