Answer: Love of friends is the work that is done by the Light that Reforms in order to connect our vessels. It seems as if they are distant from one another and that we have to bring them together, but in spirituality there are no distances. By working on our vessels, we acquire attributes that are similar to the attributes of the Light, and so we can discover what is already in us.
It is like a person who has lost his sight and by certain healing methods can rehabilitate it. This means that Kabbalists give us advice as to how to revive and rehabilitate ourselves in our current state.
This means that you remain at the same level and nothing changes but your ability to feel. This level of sensitivity is called the spiritual ladder, the levels of attainment, revelation.
From the 1st part of the Daily Kabbalah Lesson 6/19/13, Writings of Rabash