Acharya Prashant addresses the question of how saints in previous centuries, who lacked formal scientific education, avoided and helped others avoid superstitions like ghosts or 'water memory'. He explains that there are two primary ways to dispel such delusions: external scientific knowledge and internal self-knowledge. Using the analogy of a fictional entity called 'Mono', he illustrates that a person with scientific knowledge knows that such a state of matter does not exist in the physical universe. However, scientific knowledge is often secondary, mediated by others, and subject to change as new discoveries are made, which can leave a person slightly vulnerable to doubt.