Acharya Prashant discusses the nature of true silence, contrasting it with the 'cultivated silence' that people often practice. He explains that most people merely change their form from being talkative to being quiet, but this is still a decision made by the ego. This enforced silence is superficial and waiting to transform back into noise because it is a mental activity rather than a state of being. He emphasizes that one cannot be 'aware' of silence because noise cannot know silence; only silence can know silence. What people call awareness is often just a movement of the brain that would cease without the physical body.