'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.
(1) In commenting on Vedānta-sūtra 2.2.42, Śrīpāda Śaṅkarācārya has claimed that Saṅkarṣaṇa is a jīva, an ordinary living entity, but there is no evidence in any Vedic scripture that devotees of the Lord have ever said that Saṅkarṣaṇa is an ordinary living entity. He is an infallible plenary expansion of the Supreme Personality of Godhead in the Viṣṇu category, and He is beyond the creation of material nature. He is the original source of the living entities. The Upaniṣads declare, nityo nityānāṁ cetanaś cetanānām: "He is the supreme living entity among all the living entities." Therefore He is vibhu-caitanya, the greatest. He is directly the cause of the cosmic manifestation and the infinitesimal living beings. He is the infinite living entity, and ordinary living entities are infinitesimal. Therefore He is never to be considered an ordinary living being, for that would be against the conclusion of the authorized scriptures. The living entities are also beyond the limitations of birth and death. This is the version of the Vedas, and it is accepted by those who follow scriptural injunctions and who have actually descended in the disciplic succession.