Acharya Prashant explains that the concept of positive and negative thinking is rooted in the law of duality. He asserts that chasing positivity inevitably brings negativity, just as pleasure is followed by pain. He critiques the popular notion of 'positive thinking' as a form of foolishness, noting that people are often told to 'be positive' to avoid the fear of things going wrong. This reliance on hope and expectations is based on personal desires rather than reality. Using the example of a chess game, he points out that true success comes from being completely immersed in the action and reaching a state of thoughtlessness, rather than being distracted by positive or negative thoughts.