'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 Personality of Godhead is perfect and complete, and because He is completely perfect, all emanations from Him, such as this phenomenal world, are perfectly equipped as complete wholes. Whatever is produced of the complete whole is also complete by itself. Because He is the complete whole, even though so many complete units emanate from Him, He remains the complete balance." (Bṛhad-āraṇyaka Upaniṣad 5.1) It is most apparent that nondevotees violate the rules and regulations of devotional service to equate the whole cosmic manifestation, which is the external feature of Viṣṇu, with the Supreme Personality of Godhead, who is the controller of māyā, or with His quadruple expansions. The equalization of māyā and spirit, or māyā and the Lord, is a sign of atheism. The cosmic creation, which manifests life in forms from Brahmā to the ant, is the external feature of the Supreme Lord. It comprises one fourth of the Lord's energy, as confirmed in the Bhagavad-gītā (ekāṁśena sthito jagat). The cosmic manifestation of the illusory energy is material nature, and everything within material nature is made of matter. Therefore, one should not try to compare the expansions of material nature to the catur-vyūha, the quadruple expansions of the Personality of Godhead, but unfortunately the Māyāvādī school unreasonably attempts to do this.