It is said in The Book of Zohar that all the worlds, Upper and lower, and everything existing in them, are created solely for the person’s sake. All of these levels are created for only one purpose: to bring all the souls to perfection, that is, to adhesion with the Creator, at the level missing in them from the moment of the Thought of Creation.
In the beginning of creation, the Creator formed five levels or worlds, extending to our world, in order to place the soul in our world’s material body. The material body of our world is called “a desire to receive without giving anything in return.” This is the final form of a desire for delight. It is because of this that a person’s properties in our world are absolutely opposite to the Creator. By studying Kabbalah, one gradually acquires the property of bestowal, and accordingly, gradually ascends from below upwards. As a result, a person completely merges with the Creator, reaching the state for which he was created. That is why it is said that all the worlds were created for the person’s sake.
Courtesy of http://www.youtube.com/watch?v=kHc3sOXkjOw