Existence is the deepest question, widest, deepest quest. What do you mean by fundamental? Is a little subtle. Every subject is, when you study something, you are not studying yourself. The vidarna sami in panchadashi, about 700 years ago in the south of india, classic of adwata veranta,. He says that the self is the most, is the source of all happiness and everlasting happiness. So consciousness is fundamental. It's first. And anan bliss, that is fundamental. The alond of theself is the foundation of all bliss. By its light, everything here is lit up. That shining, everything shines.