'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 quadruple forms have a spiritual existence that can be realized in vāsudeva-sattva (śuddha-sattva), or unqualified goodness, which accompanies complete absorption in the understanding of Vāsudeva. The quadruple forms, who are full of the six opulences of the Supreme Personality of Godhead, are the enjoyers of the internal potency. Thinking the absolute Personality of Godhead to be poverty-stricken or to have no potency-or, in other words, to be impotent-is simply rascaldom. This rascaldom is the profession of the conditioned soul, and it increases his bewilderment. One who cannot understand the distinctions between the spiritual world and the material world has no qualification to examine or know the situation of the transcendental quadruple forms. In his commentary on Vedānta-sūtra 2.2.42-45, His Holiness Śrīpāda Śaṅkarācārya has made a futile attempt to nullify the existence of these quadruple forms in the spiritual world.