Acharya Prashant explains the profound connection between the mind and the body, noting that the mind's intentions and states are reflected through physical expressions and positions. He suggests that observing the body is often easier than observing the subtle mind to understand one's internal state. He discusses the state of deep sleep as a significant spiritual tool because it reveals that the self can exist without the world, implying that the world is merely a projection of the mind. While knowledge of these states is expressed in the waking state through language, the actual realization belongs to the fourth state, the Turiya.