The Upanishads act as some kind of circuit-breakers. You live in your own contained world, and because the world is self-contained and self-ratified, therefore there is no way any element inside your world is ever going to disrupt your world or call it out as false. The Upanishads mischievously show you a contradiction, and now you are flabbergasted because one contradiction is enough to bring down your entire mental palace. A thousand things are...