Acharya Prashant explains that silence is synonymous with the pure self or the truth. He notes that true silence is an internal state rather than a mere absence of speech or external noise. The pure self is described as unthinkable and unmeasurable, meaning it cannot be perceived through the senses or conceptualized by the mind. Therefore, sitting in physical silence for hours does not constitute real silence. Real silence occurs when the ego is fully immersed in the truth, allowing one to engage in activities like talking or walking while remaining in a silent state. If the speaker's intention is honest and aimed at bringing value, they are in a state of silence even while speaking.