Acharya Prashant explains that positive and negative thoughts are never absolute because thought is inherently dualistic and marked by uncertainty. A positive thought, such as hope, is always accompanied by the fear of its opposite, while a negative thought often contains a lingering, unreasonable hope for aversion. This duality means that thought can never provide total assurance or certainty, as the 'other side of the coin' always exists and is ready to appear. Consequently, thought leads to a state of constant defensiveness and fear, preventing true relaxation or conclusion. He further notes that thought serves as a mechanism to avoid right action and the rigors of awareness by consuming time. By remaining in a state of continuous thinking, individuals can avoid the arduous effort required for meaningful change or 'scaling the heights.' Ultimately, he points out that if a positive thought were truly positive, it would eliminate the possibility of future negativity, but in the realm of thought, both sides perpetually coexist.