Acharya Prashant explains that Brahman is the ultimate reality that stands behind the mind, senses, and life force, providing them with the power to function. According to the Upanishads, Brahman cannot be thought of by the mind or seen by the eyes; rather, it is that which enables the mind to think and the eyes to see. It is not an object of worship or a product of human imagination. True experience of Brahman is non-dual, where the individual experiencer ceases to exist, and only the experience remains. This state is beyond ordinary experiences driven by a sense of incompleteness or the desire for worldly gains like wealth and prestige.