The traditional accounts present Asaṅga and Vasubandhu as brothers whose lives and work are deeply intertwined with the emergence of Yogācāra thought. Asaṅga is regarded as the elder and as the primary founder of this current of Mahāyāna, while Vasubandhu, initially a renowned Sarvāstivāda Abhidharma scholar, later became its most incisive systematizer. Hagiographical narratives describe Asaṅga receiving Yogācāra teachings in visionary encounters with Maitreya, and then using these revelations to articulate a new orientation centered on the analysis and transformation of consciousness. Within this framework, Asaṅga’s role is that of the original architect, setting out the broad doctrinal and meditative landscape upon which later Yogācāra reflection would unfold.

Vasubandhu’s relationship to Asaṅga is portrayed both as familial and as that of a disciple to a teacher. Having first established himself within non-Mahāyāna scholastic circles, Vasubandhu is said to have been persuaded by Asaṅga to adopt the Mahāyāna and, more specifically, the Yogācāra vision. After this turning, he did not merely repeat his brother’s ideas but subjected them to rigorous analysis, condensing and clarifying the sometimes expansive Yogācāra materials into tightly argued treatises. Texts such as the “Twenty Verses on Consciousness-only” and the “Thirty Verses on Consciousness-only” exemplify this move: they present the thesis of vijñapti-mātra—“consciousness-only”—in a concise, philosophically sharpened form, suitable for debate with rival schools.

Seen together, Asaṅga and Vasubandhu function as complementary poles in the early development of Yogācāra. Asaṅga, drawing on visionary inspiration and extensive doctrinal compilation, offers the overarching vision of a path grounded in the primacy and transformation of consciousness. Vasubandhu, bringing to bear his training in Abhidharma and logical analysis, refines this vision into a coherent philosophical system, elaborating its psychology and epistemology and defending it against alternative Buddhist positions. Their combined efforts yield not merely a collection of teachings but a comprehensive school of thought, one that would shape Mahāyāna philosophy across diverse cultures. In this way, the relationship between the two is less a simple hierarchy of founder and follower and more a dynamic collaboration in which inspiration and critical reflection mutually complete one another.