Acharya Prashant explains the opening of the Shvetashvatara Upanishad, where sages inquire into the fundamental cause of the universe, our origin, and the force behind our experiences of pleasure and pain. The inquiry focuses on three core subjects: Brahman, the self (Jiva), and the world (Prakriti). The speaker clarifies that elements like time, nature, destiny, chance, the five elements, or the individual soul cannot be the primary cause. This is because the world (object) and the individual (subject) are mutually dependent; the world exists for the experiencer, and the experiencer is shaped by worldly experiences. Neither can be the ultimate, independent foundation.