Baal HaSulam, “The Teaching of Kabbalah and Its Essence”: And the most important thing in this whole diverse reality is the sensation given to the animals—that each of them feels its own existence. And the most important sensation is the noetic sensation, given to man alone, by which one also feels what is in another—the pains and comforts.
Of all of creation, the human is the most developed regarding his desires. How can we know about them? This is according to his movements and actions, all of which essentially constitute the expression of his inner desire.
Look at what a mess the human makes in the world. On the other hand, animals don’t change anything but only move in order to fulfill their desires, and with the vegetative level, there isn’t even enough desire to move. Therefore, it follows that the human is motivated by the greatest desire. He wants to change the world and himself and not just move and grow. This is what he uses the powers found within him for.
Thus, the human is the center of creation, the creature that was developed at the end of creation and for whom the entire creation was developed. Therefore, we must understand: All of the reality of the still, vegetative, and animate is intended to serve the human and to be useful to him only in order to attain the goal.
What is the goal? The human must reach that higher power that created him. It is concealed from the human as a result of the law of equivalence of form, and a person must change himself in order to reach the similarity of properties according to the law of equivalence of form, and he will fully reveal this power that created him. This identification and approximation is called adherence which is revealed as complete connection. This is what the human being must reach.
From the 4th part of the Daily Kabbalah Lesson 11/14/13, Writings of Baal HaSulam