Acharya Prashant explains that thoughts serve to secure their master, the ego. Thoughts exist to secure the individual, not so much in a physical sense, but more in a psychological one. Thought is not autonomous; it is a dependent phenomenon tied to its center, which is the ego. The thinker is the ego, and thoughts exist to save and secure the thinker psychologically, ensuring the ego remains as it is. No matter how much one thinks, the process of thinking will not fundamentally change the thinker. The speaker clarifies that what changes the thinker is the observation of thought. This involves witnessing the entire triad: the thinker, the process of thinking, and the thought itself. However, people are usually not witnesses to their thoughts; they remain the subject of their thoughts. The thinker can keep thinking, but thinking will not change the thinker just because they have been thinking. The thinker is not going to hurt their own perceived self-interest through thinking. Applying this to relationships, the speaker states that the thinker, being the ego, will make choices that reinforce their current self. When choosing a partner, a person will select someone who pleases and ingratiates them, but never one who challenges them to their core. A partner who could offer real help by challenging one's fundamental beliefs would be rejected by the thought process. This is because thought is the ego's own doing, and it will not allow itself to be challenged. Consequently, our relationships often result in the continuation and even aggravation of our misery. To make a better choice in a relationship, one must be willing to challenge the very center from which all choices are made. The speaker uses the analogy of a book: to change one chapter, one must be willing to rewrite the entire book. It is not possible to rectify one particular choice without addressing the underlying pattern. One must be ready to observe all choices being made, 24/7, as every small choice is a rehearsal for the bigger ones. Unless one is ready to challenge the very center—the ego—from which all choices arise, it is not possible to rectify one particular choice, such as the choice of a partner.