Acharya Prashant explains that to see, two kinds of light are needed. The first is the external light that must fall on the object you want to see. The second is an internal light that must be present to perceive the external object, the external light, and even the internal subject. Without this internal light, you would be blind even in a room flooded with external light. If your eyes have no light, you will see nothing. Light connects the subject with the object. If there is no external light, there is no object. Therefore, light is what forms the relationship between the seer-subject and the seen-object. In other words, light is at the base of the world itself, the seen world. Brahman is described as the light behind the light, the truth behind the world. It is the base, the foundation of all your experiences. Something special needs to be there for the subject to experience any object, and that something special is Brahman. For instance, an unconscious or dead man has the entire world around him, but he experiences nothing. Brahman is at the foundation of all experiences. Otherwise, the sensual objects and the sensing mechanism can be there, yet there would be no sensation. For sensation to happen, a miracle is needed, and that miracle is called consciousness. Had consciousness not been a miracle, science would have been able to duplicate it. If consciousness were just a property of material, science would be able to manipulate material and produce consciousness. But you cannot have artificial consciousness. That something special that gives birth to, enables, and sustains consciousness is called Brahman. It is that which the self-knowers know. This is a bit tricky. The self-knower comes to know the non-existence of the self. The self-knower does not remain existent anymore. In fact, the self-knower loses his confidence in all that he knew about the self until now. The false self falls, along with all the false knowledge it had about itself. So, the self-knower actually becomes free of knowledge. Knowing the self is not like an accretion in your knowledge base; it is an exercise in acknowledging the deficiency of your existing notions and beliefs. It is a process of losing your false realizations. Brahman is just liberation from false knowledge. What is Brahman? Nothing in particular, just freedom. If freedom is something in particular, then freedom is not free of that thing in particular. Therefore, freedom or liberation is just nothing in particular. You don't have to create anything; you have to get rid of a lot. After that, creation happens on its own. You have to let the bird out of the cage, and then the flight happens on its own. You don't have to teach her to fly.