Acharya Prashant explains that oneness does not mean becoming physically one with others in the external world, as diversity and fragmentation are inherent to the physical realm. Instead, true oneness must be maintained within. Fragmentation occurs internally when the mind becomes a mirror of the external world, allowing various objects, people, and influences to occupy mental space and divide the self. He emphasizes that the internal space is the sacred province of the absolute and should remain undivided, regardless of the many forms the world takes outside.