Acharya Prashant explains that true knowledge, as described in the Upanishads, is that which brings the mind to a state of stillness. He contrasts this with ordinary worldly knowledge, which acts like a vibration in the mind, causing agitation, excitement, or disappointment. Worldly knowledge is inherently unstable because it is never final and is always subject to being replaced by newer, more attractive versions. It is bound by time and carries an expiration date, whereas the knowledge of the Upanishads is timeless and independent of the material world. This 'still knowledge' is not just information but a realization of the futility of worldly pursuits, leading to a state of awakening or 'Bodha'. He further describes this awakening as a fire that purifies everything it touches. Just as fire transforms fuel into itself or reduces it to ash without losing its own nature, true understanding consumes the false and remains untainted. Acharya Prashant emphasizes that while we must rely on external supports in the physical world, the inner world must be free from all crutches, including thoughts, persons, or ideologies. One who stands without any inner support becomes unshakeable and attains a steady seat of consciousness. This state of being is compared to fire, which appears when there is something to burn, performs the act of purification, and then returns to its formless state once the fuel is exhausted.