Answer: The power of unity is derived from people rising above their ego. The idea is not unity itself. Rather, it is a person attaining it by rising above his ego, and in contrast to it, he connects his desire with the desires of others. With this single and unified desire that is created from unity above the ego, a person achieves the wonderful attribute of unity.
Nevertheless, a very strong tension is created between the egoistic characteristics that want to sever the connection between us and the altruistic characteristics that connect us above the ego. This potential difference between the plus and the minus creates a state called a spiritual Kli within which the Creator is revealed.
From the Kabbalah Lesson in Russian 2/19/17