Acharya Prashant addresses the issue of overthinking and anxiety by explaining that the mind naturally tends to dwell on trivial matters when it lacks a sense of purpose or importance. He compares random, unimportant thoughts to germs or pathogens that are always present in the environment; one cannot eliminate them entirely, but one can develop 'inner immunity.' This immunity is built by identifying what is truly worthy and important in life and dedicating oneself to it. When the mind is filled with a significant mission or passion, there is no vacancy for trivial worries or random distractions.