When the souls unite together, a person discovers a new reality. Currently we experience ourselves as living in this world, which is at the level of individual existence; each part is disconnected from the entire organism. Yet, despite the fact that all these parts are alive and
aware of their individual existence, there is a difference between a body that is whole and a body whose parts are disconnected.
Right now, each disconnected individual is receiving a lifeline and life support, like an organ extracted from the body for transplant into another organism. Consequently, they are like “ready-for-transplant organs” on life support, which ensures they don’t descend below the animalistic existence. These organs perceive themselves as living in this reality. That’s who we are.
If we, a group of such organs, desire to unite and we ask for it, then our collective desire (the prayer called MAN) draws from Above (from a higher level) the force that unites us. Subsequently, in our unity we perceive the spiritual reality, as a body whose organs begin to connect with each other.
Thus, the entire organism experiences a different life, not the existence each of them once lived separately by striving to survive on its animalistic level. We ascend from the animalistic level of existence to a new level called human.
The sensation of this collective life of all “bodily organs” (the collective soul) is called the spiritual world. We will no longer even be able to perceive the previous existence as life because we’ll no longer live to survive, but instead will support each others’ lifeline. The Light gives us a completely new and different reality.
Our previous life on the animalistic level will look extremely low and undesirable. We’ll need it solely in order to absorb the desires of others who are still living in our world as animals; these are the desires that haven’t joined our connection yet. Gradually they will also begin to ascend. However, once having attained our spiritual life, this lower level will be unnecessary since we will all have ascended to a higher dimension.
From the 1st part of the Daily Kabbalah Lesson 5/18/10, The Zohar