Acharya Prashant explains that the state of 'just being' or 'pure existence' refers to absolute oneness, where only the Truth exists. For most people, this is merely a theoretical concept because their sense of self is constructed from the influence of many others rather than being solitary or pure. He emphasizes that one should not worry about 'just being' but should instead observe the crowd of influences that currently define their identity. The desire for pure existence arises only when one begins to feel burdened or troubled by the presence of these external influences and seeks to be free from them.