So that portion, eko 'py asau racayitum, He is the origin, origin of universal . . . this material creation. Kāraṇārṇavaśāyī Viṣṇu. From Him, the Garbhodakaśāyī Viṣṇu comes out, and He enters in each and every universes, Garbhodakaśāyī Viṣṇu. That Garbhodakaśāyī Viṣṇu again expands as Kṣīrodakaśāyī Viṣṇu. That Kṣīrodakaśāyī Viṣṇu is within this universe. In each and every universe there is Viṣṇu, Śvetadvīpa-loka where Kṣīrodakaśāyī Viṣṇu is there, and that Kṣīrodakaśāyī Viṣṇu enters within the heart of all living entities, Paramātmā, Antaryāmī.
That is explained in the Bhagavad-gītā, eko 'py asau racayituṁ jagad-aṇḍa-koṭiṁ yac-chaktir asti jagad-aṇḍa-cayā yad-antaḥ aṇḍāntara-stha . . . (Bs. 5.35). He is not only within this universe, but He is also within the atom.
Aṇḍāntara-stha-paramāṇu-cayāntara . . . paramāṇu means atom. In this way Lord Viṣṇu is expanded, and He is jñeyam, He is to be understood. Jñāna, knowledge, simply material knowledge is not perfection of knowledge. Real knowledge is to understand the Supreme Absolute Truth, Viṣṇu. That is real knowledge. That is explained here, jñeyaṁ yat tat pravakṣyāmi: "I shall now explain to you what is the ultimate goal of knowledge."