The Zohar, Chapter "Tetzaveh (Command)," Item 114: There are five abstentions on the day of atonement—eating, drinking, bathing, lubrication, wearing shoes, and intercourse—to be assisted by the five upper sides, HGT NH, which the day of atonement, Bina, brought out, and which are her gates.
Since we must transition from the perception of reality in the egoistic desires to the perception of reality in the desires of bestowal, the authors of The Zohar (like all other Kabbalists), tell us about the various corrections we must make in our desire; we move from one rung to the next, in order to further advance each of our five senses toward spirituality. All five senses are connected with each other, and for this reason we always have a spiritual Partzuf, meaning a definitive perception of reality with limitations.
In order to transition from the current perception of reality to a more advanced one, we must increase our desire and attract the Reforming Light to it. In this way, we will build the next Partzuf that is our self on a higher level. We do this by opening more and more of the senses, the perception of reality. This is the way we advance.
All of the obstacles that the The Zohar describes, such as the "scapegoat," the "five prohibitions," and so on, are solely limitations. We perform these limitations according to the Kabbalists’ recommendations, and as a result, we come to corrections faster. After all, they tell us in advance what is worth doing on every step, in order to direct oneself to the perception of reality on a more complex, inner, and deeper level. Then, without fail, we advance with greater speed and certainty.
From the 1st part of the Daily Kabbalah Lesson 6/3/10, The Zohar