Answer: It’s just a little egoism. By changing it, we will feel not only the property of reception in it, but also the property of bestowal. In the egoism corrected to bestow, we begin to sense what really exists outside of us.
Now we feel and analyze only what enters into our senses: sight, hearing, taste, smell, and touch. If we had additional sense organs, we would feel much more, not as it enters and adapts in us, but as it exists outside of us, objectively. This is called spiritual perception.
From the Kabbalah Lesson in Russian 12/10/17