Acharya Prashant explains that the emergence of impurities in the mind, even after engaging in spiritual study and company, is actually a sign of progress. Just as a black mark is only visible on a clean wall, spiritual practices clean the mind to a point where previously hidden impurities become noticeable. He clarifies that these impurities are not new; they are ancient tendencies and deep-seated knots that have existed for eons. The process of spiritual association does not create these flaws but rather uncovers them, much like lifting a carpet reveals the dust that was already underneath. He advises against blaming the teacher or the practice for these realizations, noting that a common egoic trap is to believe one was 'better' before starting the spiritual journey.