'dvitīya catur-vyūha' ei--turīya, viśuddha
vāsudeva-the expansion named Vāsudeva; saṅkarṣaṇa-the expansion named Saṅkarṣaṇa; pradyumna-the expansion named Pradyumna; aniruddha-the expansion named Aniruddha; dvitīya catuḥ-vyūha-the second quadruple expansion; ei-this; turīya-transcendental; viśuddha-free from all material contamination.
Vāsudeva, Saṅkarṣaṇa, Pradyumna and Aniruddha constitute this second quadruple. They are purely transcendental.
The original quadruple forms Kṛṣṇa, Baladeva, Pradyumna and Aniruddha expand into another quadruple, which is present in the Vaikuṇṭha planets of the spiritual sky. Therefore the quadruple forms in the spiritual sky are the second manifestation of the original quadruple in Dvārakā. As explained above, Vāsudeva, Saṅkarṣaṇa, Pradyumna and Aniruddha are all changeless, transcendental plenary expansions of the Supreme Lord who have no relation to the material modes. The Saṅkarṣaṇa form in the second quadruple is not only a representation of Balarāma but also the original cause of the Causal Ocean, where Kāraṇodakaśāyī Viṣṇu lies asleep, breathing out the seeds of innumerable universes.