Having defined the two categories of individual souls (fallible and infallible), Krishna introduces a third, completely distinct entity: the 'uttamaḥ puruṣas tv anyaḥ' (the Supreme Person, who is someone else entirely). This entity is celebrated as the Paramātmā (the Supreme Soul). What does He do? As the imperishable Lord (avyaya īśvaraḥ), He enters into the three worlds (loka-trayam āviśya) and personally maintains them (bibharti).