Answer: According to the effort that a person gives, he becomes more sensitive to the characteristic of bestowal, and through this he receives new stimulation and feelings from the spiritual world, from his spiritual state. For nothing exists besides the world of Infinity.
We are facing the world of Infinity and develop our sensitivity towards it. I give effort to “polishing” myself and to raising my sensitivity by one level. In this way I already begin to see inside some kind of space within this world of Infinity. I begin to identify things, characteristics, and according to the effort that I made, I feel and identify connections.
As a result of my effort, the Light comes and reforms me; I become more sensitive to that system in which I exist. I simply don’t feel it now. I am only sensitive to the information that I receive through my five animal senses because I am living within my animal body and I don’t feel anything more.
From the 3rd part of the the Daily Kabbalah Lesson 3/23/14, Writings of Baal HaSulam