Acharya Prashant addresses the issue of being troubled by thoughts of the past. He clarifies that there is no problem with thoughts about the past arising in the mind. In fact, he states that every thought is fundamentally rooted in the past; without the past, a thought cannot even be conceived. All thoughts are either about the past or the future, and there is nothing inherently wrong or criminal about their existence. The core problem, he explains, is not the thought itself but getting stuck in a continuous loop of thinking. He uses the analogy of an infinite recursive loop in programming, where one instruction leads to another, which in turn leads back to the first, creating a cycle. This is the state of 'professional thinkers' who ponder the same issue repeatedly without reaching any conclusion, like circling the same room and expecting to arrive at a new destination. This endless thinking is what causes suffering. Thought is a very important and powerful tool available to the human mind. It should be used like a lift to ascend to a higher level of understanding. However, once the destination is reached, one must step out of the lift. Similarly, once a thought matures into understanding, it should dissolve, leading to a state of 'thoughtless attention'. One cannot remain in the process of thinking forever. The purpose of thinking is to arrive at a solution and end the thought process. Acharya Prashant suggests that if thoughts of the past keep recurring, it is because those issues have not been fully and honestly resolved. He advises to welcome these thoughts instead of fighting them. One should sit with the thought and fearlessly investigate its origin and purpose. By doing so, one will realize that the root causes are often small and childish, even though they generate significant mental turmoil. Once the cause is clearly seen and understood, one is freed from the thought, and it no longer needs to be entertained.