In Won Buddhism, there is not one specific holy text that is considered the ultimate authority. Instead, the teachings and principles of Won Buddhism are derived from a combination of traditional Buddhist scriptures and modern interpretations and applications.

The primary source of teachings in Won Buddhism is the Tripitaka, which is the traditional Buddhist canon. This includes the Sutras, which are the recorded teachings of the Buddha, and the Vinaya, which outlines the rules and guidelines for monastic life. These texts are considered sacred and are studied and revered by Won Buddhist practitioners.

However, unlike other forms of Buddhism, Won Buddhism also incorporates modern teachings and interpretations into its practices. This includes the writings and teachings of the founder of Won Buddhism, Sotaesan, as well as other contemporary teachers and scholars.

One of the key principles of Won Buddhism is the concept of "living Buddhism," which emphasizes the application of Buddhist teachings in daily life. As such, the teachings and practices of Won Buddhism are not limited to one specific text, but rather are constantly evolving and adapting to the needs and realities of modern society.

In addition to traditional scriptures and modern interpretations, Won Buddhism also places a strong emphasis on personal experience and self-reflection. This means that practitioners are encouraged to explore and discover their own understanding of Buddhist principles, rather than relying solely on external texts or authorities.

Overall, while there is no one holy text in Won Buddhism, the teachings and principles of the religion are rooted in traditional Buddhist scriptures and are constantly evolving through modern interpretations and personal experiences. This allows for a dynamic and adaptable approach to Buddhism that is relevant to the modern world.