…all the worlds, Upper and lower and everything within them, were created only for man [to attain complete equivalence to the Creator]. This is so because all these degrees and worlds came only to complement the souls in the measure of Dvekut [equivalence in properties of love and bestowal] that they lacked with respect to the Thought of Creation [as the Creator said: I have created the evil inclination in man].
In the beginning, they were restricted and hung down degree-by-degree and world after world, down to our material [egoistic] world, to bring the soul into a body of this world, which is entirely to receive and not to bestow [the desire to receive with the intention for oneself. The desire to receive with the intention to bestow is considered to be bestowal. It follows that the intention determines the nature of the action or desire], like animals and beasts. It is written, “A wild ass’s colt is born a man.” This [the desire to receive with the intention to receive] is considered the complete will to receive, which has nothing in the form of bestowal. In that state, a man is regarded as the complete opposite of Him, and there is no greater remoteness than that.
Afterward, through the soul that clothes within one, he engages in Torah and Mitzvot. Gradually and slowly, from below Upwards, he obtains the same form [intention] of bestowal as his Maker, through all the discernments that hung down from Above downwards, which are but degrees and measures in the form of the desire to bestow.
Each Higher degree means that it is farther from the will to receive and closer to being only to bestow. In the end, one is awarded being entirely to bestow and to not receive anything for himself [after one corrects all the intentions on all of one’s desires]. At that time, one is completed with true Dvekut with Him, for this is the only reason why man was created. Thus, all the worlds and everything in them were created only for man.
– Baal HaSulam, “Introduction to the Preface to the Wisdom of Kabbalah,” Item 9