'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.
(4) To answer Śaṅkarācārya's commentary on Vedānta-sūtra 2.2.45, the substance of the transcendental qualities and their spiritual nature is described in the Laghu-bhāgavatāmṛta (Pūrva 5.208-214) as follows: "Some say that transcendence must be void of all qualities because qualities are manifested only in matter. According to them, all qualities are like temporary, flickering mirages. But this is not acceptable. Since the Supreme Personality of Godhead is absolute, His qualities are nondifferent from Him. His form, name, qualities and everything else pertaining to Him are as spiritual as He is. Every qualitative expansion of the absolute Personality of Godhead is identical with Him. Since the Absolute Truth, the Personality of Godhead, is the reservoir of all pleasure, all the transcendental qualities that expand from Him are also reservoirs of pleasure. This is confirmed in the scripture known as Brahma-tarka, which states that the Supreme Lord Hari is qualified by Himself, and therefore Viṣṇu and His pure devotees and their transcendental qualities cannot be different from their persons. In the Viṣṇu Purāṇa Lord Viṣṇu is worshiped in the following words: 'Let the Supreme Personality of Godhead be merciful toward us. His existence is never infected by material qualities.' In the same Viṣṇu Purāṇa it is also said that all the qualities attributed to the Supreme Lord, such as knowledge, opulence, beauty, strength and influence, are known to be nondifferent from Him. This is also confirmed in the Padma Purāṇa, which explains that whenever the Supreme Lord is described as having no qualities, this should be understood to indicate that He is devoid of material qualities. In the First Chapter of Śrīmad-Bhāgavatam (1.16.29) it is said: 'O Dharma, protector of religious principles, all noble and sublime qualities are eternally manifested in the person of Kṛṣṇa, and devotees and transcendentalists who aspire to become faithful also desire to possess such transcendental qualities.' " It is therefore to be understood that Lord Śrī Kṛṣṇa, the transcendental form of absolute bliss, is the fountainhead of all pleasurable transcendental qualities and inconceivable potencies. In this connection we may recommend references to Śrīmad-Bhāgavatam, Third Canto, Chapter Twenty-Six, verses 21, 25, 27 and 28.