Acharya Prashant explains that our thoughts and opinions are rarely our own; they are almost entirely dictated by external influences such as the body and society. He points out that factors like one's place of birth, nationality, and physical gender determine one's likes, dislikes, and political or social stances. These opinions are random and lack inherent value because they are based on coincidental circumstances, such as being born in a specific country or being assigned a particular hostel in college. He emphasizes that people often take these borrowed opinions so seriously that they are willing to fight or die for them, without realizing they are merely acting as mouthpieces for their conditioning.