Acharya Prashant addresses the misconception regarding 'inside' and 'outside' by questioning the physical boundaries people often associate with the self, such as the skin or the skull. He explains that the mind is not truly 'inside' because anything that can be observed, touched, or understood is an object of understanding and therefore external to the observer. He uses the analogy of an onion to illustrate that as one peels away layers of personality and external influences, what remains is the pure understanding that observes these layers. He asserts that everything that can be known is external, and there is nothing that can be truly called 'internal' in the traditional sense.