Abhidharmakośa-Bhāṣya

The central framework is a two-level exposition: the verses (kārikā) present the Sarvāstivāda-Vaibhāṣika Abhidharma system, while Vasubandhu's prose auto-commentary (bhāṣya) subjects that system to sustained critique from a Sautrāntika perspective. The work proceeds through nine chapters covering the elements (dhātus), faculties (indriyas), the world (loka), karma, latent defilements (anuśayas), the path and persons, knowledge (jñāna), meditative attainments (samāpatti), and the refutation of the self (ātman) . Vasubandhu often presents the Vaibhāṣika position in the verse, then argues in the commentary that the Sautrāntika view is preferable, while sometimes remaining neutral or non-committal. This internal tension is not a flaw but the work's distinctive method: it is a record of a living scholastic debate, not a dogmatic manual.

The Sanskrit text was long known only through fragments and citations until the twentieth century. In 1934, Rāhul Sāṃkṛtyāyana discovered an incomplete palm-leaf manuscript of the kārikā portion at Ngor monastery in Tibet; on a later expedition in 1936, he photographed a complete manuscript of the Bhāṣya at the same monastery, and Giuseppe Tucci photographed the same manuscript in 1939 . These discoveries allowed Prahlad Pradhan to publish the first critical edition of the Sanskrit Bhāṣya in 1967, revised in 1975 . Prior to that, Louis de La Vallée Poussin's French translation (1923–1925) was based primarily on the Chinese and Tibetan versions . The Pradhan edition remains the standard Sanskrit text, though a new critical edition incorporating the Ngor manuscript and other witnesses remains a desideratum.

The relationship is one of development and revision, not simple continuity. The Kośa-Bhāṣya represents Vasubandhu's pre-Yogācāra period, working within the Sarvāstivāda-Sautrāntika framework. His later Yogācāra works, such as the Triṃśikā and Viṃśatikā, introduce doctrines—the storehouse consciousness (ālaya-vijñāna), manifestation-only (vijñaptimātra), and the three natures—that are absent from the Kośa. However, the Kośa already contains Sautrāntika ideas, such as the seed (bīja) theory of karmic persistence, that anticipate Yogācāra solutions . The Karmasiddhiprakaraṇa, which develops the storehouse consciousness as the bearer of karmic seeds, can be read as Vasubandhu working through problems left unresolved in the Kośa. The later works thus revise and extend positions the Kośa had already gestured toward.

The Kośa-Bhāṣya became the standard textbook of Abhidharma in India and Tibet, studied in monastic universities across the Buddhist world. Its influence derives from its comprehensive scope, its systematic organization, and its critical method: it presents the Vaibhāṣika system in full while simultaneously subjecting it to scrutiny, giving students access to both the orthodox position and its most powerful critics. In Tibet, it was studied alongside the commentaries of Sthiramati and Yaśomitra, and it became a foundational text for the study of Buddhist philosophy of mind and causation . Its influence extends beyond Buddhism: it is a key source for understanding the Sarvāstivāda school, and it provides one of the most detailed accounts of Buddhist cosmology and psychology in the classical Indian tradition .

Yaśomitra's Sphuṭārthā Abhidharmakośa-vyākhyā is the most important extant Indian commentary on Vasubandhu's Bhāṣya. It is invaluable because it clarifies difficult passages, supplies grammatical explanations, and preserves doxographical information about the Vaibhāṣika and Sautrāntika positions . Yaśomitra wrote from a Sautrāntika perspective, and his commentary is often our best guide to the arguments Vasubandhu is engaging. The Sanskrit text of Yaśomitra's commentary was edited by Unrai Wogihara (1932–1936), and it is frequently consulted alongside Pradhan's edition of the Bhāṣya. For readers working through the Bhāṣya in translation, Yaśomitra's commentary is the essential companion, though it has not been fully translated into English .

The most common misunderstanding is that Vasubandhu is simply a Vaibhāṣika who presents the orthodox Sarvāstivāda system without critique. In fact, the Bhāṣya is a critical work: Vasubandhu frequently rejects Vaibhāṣika positions in favor of Sautrāntika alternatives, and he sometimes declines to endorse any position definitively. The verses present the Vaibhāṣika system, but the commentary often undermines it . A related misunderstanding is that the Kośa represents Vasubandhu's final philosophical position. It does not: he later converted to Mahāyāna and wrote the Yogācāra works for which he is also famous. The Kośa is a snapshot of a brilliant thinker working within and against the Abhidharma tradition, not a settled statement of his mature philosophy.