Acharya Prashant addresses the issue of overthinking and anxiety by explaining that the mind naturally seeks something to occupy itself. When a person lacks a sense of purpose or a worthy goal, the mind inevitably fills that vacancy with trivial, random thoughts and everyday worries. He compares these unimportant thoughts to germs or pathogens that are always present in the environment; one cannot eliminate them entirely but can develop 'inner immunity' by focusing on what is truly important. If the mind is not occupied with something significant, it will waste time on 'nothing in particular,' leading to a life that is scattered rather than immersed.