Triṃśikā (Thirty Verses on Consciousness-Only)

The central thesis is that what we take to be a self and a world of external objects are merely transformations of consciousness (vijñāna-pariṇāma). Vasubandhu argues that the duality of subject and object, self and other, is a fabrication projected by consciousness itself, and that nothing exists apart from these conscious transformations . The text rejects the realist view that external objects exist independently of the mind, and it also rejects the view that the self is a real, permanent entity. The Triṃśikā is a companion to the Viṃśatikā, which defends this thesis against objections; the Triṃśikā presents the positive doctrine, mapping the structure of consciousness and the path to realizing consciousness-only.

Vasubandhu describes three transformations of consciousness. The first is the storehouse consciousness (ālaya-vijñāna), which contains the seeds of all past experience and karmic traces; it is like a great river, always changing, neither pleasant nor unpleasant, and it ceases when one becomes fully realized . The second is the afflicted mind (manas), which takes the storehouse consciousness as its object and generates the four defilements of self-regard, self-delusion, self-pride, and self-love . The third comprises the six active consciousnesses (the five sense consciousnesses and thought consciousness), which arise depending on causes and conditions, like waves arising in water . Together, these three transformations produce the illusion of a self and a world of objects.

The three natures are the imagined nature (parikalpita-svabhāva), the dependent nature (paratantra-svabhāva), and the perfected nature (pariniṣpanna-svabhāva). The imagined nature is the false projection of self and other onto experience; the dependent nature is the causal flow of consciousness itself, which arises dependently but is not ultimately real; the perfected nature is the realization that the imagined nature is absent from the dependent nature . Vasubandhu argues that the path consists in realizing that the imagined nature does not exist in the dependent nature, and that this realization is the perfected nature itself. The three natures are not three separate realities but three ways of understanding the same stream of experience: as falsely projected, as dependently arisen, and as perfectly realized when projection ceases.

Xuanzang, the seventh-century Chinese pilgrim and translator, translated the Triṃśikā into Chinese in 648 CE and then composed the Cheng Weishi Lun (Vijñaptimātratā Siddhi) as a commentary on it, drawing on ten Indian commentaries, especially that of Dharmapāla . The Cheng Weishi Lun became the foundational text of the East Asian Yogācāra school (Wei-shi), and Xuanzang's disciple Kuiji wrote an influential sub-commentary on it . The work is not a simple translation of Vasubandhu's verses but a synthesis of Indian commentarial traditions, and it is the primary source through which Vasubandhu's Yogācāra was received in China, Korea, and Japan. For this reason, the Triṃśikā is often studied alongside the Cheng Weishi Lun rather than in isolation.

The Sanskrit text of the Triṃśikā was edited by Sylvain Lévi in 1925, based on a manuscript discovered in Nepal, alongside Sthiramati's commentary . The work also survives in Tibetan and two Chinese translations, the most important being Xuanzang's . A critical edition of Sthiramati's Triṃśikāvijñaptibhāṣya, with Sanskrit and Tibetan texts, was published by Hartmut Buescher in 2007 . The standard English translation of the Triṃśikā itself is found in Francis H. Cook's Three Texts on Consciousness Only (Numata Center, 1999), which also includes translations of the Viṃśatikā and the Cheng Weishi Lun . A more recent translation of the Triṃśikā with Sthiramati's commentary has been published by Numata Center, and the BDK edition remains the most accessible entry point for English readers .

The most common misunderstanding is that 'consciousness-only' means that everything is a projection of a single, universal mind, or that the external world is an illusion in the sense of being nothing at all. Vasubandhu's position is subtler: he denies that external objects exist as they are conceived by realists—as independent, partless atoms or as unified composites—but he does not deny the reality of conscious experience itself. The Triṃśikā is a phenomenological and soteriological analysis of how the mind constructs the experience of self and world, not a metaphysical denial of everything except a cosmic subject . The text itself is controversial: it can be read ontologically, as a form of idealism, or epistemologically, as an account of how cognitive experience is fabricated by the mind . The later Yogācāra tradition and modern scholars continue to debate which reading is correct.