'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.
"Considering all these points, one should understand that Śaṅkarācārya's statement that Saṅkarṣaṇa is born as a jīva is completely against the Vedic statements. His assertions are completely refuted by the above arguments. In this connection the commentary of Śrīdhara Svāmī on Śrīmad-Bhāgavatam (3.1.34) is very helpful."