Vasubandhu, the co-founder of Yogachara Buddhism, was a renowned philosopher and scholar who made significant contributions to the development of Buddhist thought. One of his most influential concepts is the idea of "mind-only" or "consciousness-only" (vijñapti-mātra) in Yogachara philosophy. This concept holds that all phenomena, including the external world, are ultimately perceived and experienced through the mind.

The significance of Vasubandhu's concept of "mind-only" lies in its radical departure from traditional Buddhist teachings. In early Buddhism, the concept of an external world independent of the mind was central to the teachings of impermanence and non-self. However, Vasubandhu argued that the external world is merely a projection of the mind and has no inherent existence. This idea challenged the traditional understanding of reality and sparked a new way of thinking about the nature of existence.

One of the key implications of the "mind-only" concept is the rejection of the concept of a permanent self. In Yogachara philosophy, the self is seen as a mere construction of the mind, constantly changing and dependent on external factors. This challenges the idea of a permanent, unchanging self that is central to many other philosophical and religious traditions. By understanding the self as a product of the mind, Vasubandhu believed that individuals could free themselves from the suffering caused by attachment to a fixed identity.

Another important aspect of the "mind-only" concept is its emphasis on the role of consciousness in shaping our perceptions and experiences. According to Vasubandhu, consciousness is not a passive receiver of external stimuli, but an active force that creates our reality. This idea has had a significant impact on the understanding of consciousness in both Eastern and Western philosophy.

The concept of "mind-only" also has practical implications for the practice of meditation and mindfulness. By recognizing the illusory nature of the external world, individuals can cultivate a deeper understanding of their own minds and the processes that shape their experiences. This can lead to a greater sense of inner peace and liberation from attachment to external phenomena.

In conclusion, Vasubandhu's concept of "mind-only" is a fundamental aspect of Yogachara philosophy that challenges traditional Buddhist teachings and offers a unique perspective on the nature of reality. Its emphasis on the role of consciousness and the rejection of a permanent self has had a profound impact on the understanding of the mind and the practice of meditation.