Reading Ashtavakra Gita gives me more insight into this than any other literature that I have read. The ultimate reality is that: There's nothing else other than this. This is all there is.

To anyone discussing whether or not consciousness exist, tell me do you have proof that other people have consciousness? There's simply no credible answer to this question other than "well they have to be...cause we share the same material". But that is a experiment with a sample of 1. The weird thing is, if you are able to proof someone else's consciousness, that is just an extension of your own consciousness.

Next question, how do you prove that you are not sleeping right now? What proof do you have that you are not living inside an illusion? You have surely experienced the illusion of understanding i.e. you realized that you "understanding" or the feeling of "understanding" was wrong. What is to say that this is not happening now?

In reality, there is nothing to discover. There is just this and that is all there is.