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 suggests that random thoughts and fears are like pathogens that are always present in the environment; one cannot eliminate them entirely but can develop an 'inner immunity' by focusing on what is truly worthy. When a person is deeply involved in a significant mission or work, the mind has no vacancy for unimportant distractions. He emphasizes that the mind cannot tolerate a vacuum and will always find something to 'chew' on, so it is essential to consciously choose something important to occupy it. He introduces the concept of 'immersion' as the ultimate way to live and the best form of meditation. By being fully immersed in a meaningful task, one loses track of time and becomes shielded from mental troubles like depression and anxiety. He argues that mental illness is often a sign that life is devoid of essence. Using the example of Bhagat Singh, he illustrates how a person dedicated to a great cause, such as freedom, remains focused and immortal even in the face of death. He encourages the audience to find something worth living for as early as possible to avoid squandering their lives on 'nothing in particular.'