Sant Mat, also known as the Path of Inner Light and Sound, is a spiritual tradition that focuses on the inner journey towards self-realization and union with the Divine. It has its roots in the ancient Indian spiritual tradition of Sant Mat, which means "Path of the Saints."

One of the key principles of Sant Mat is the importance of a living spiritual teacher or guru, who guides the disciple on their spiritual journey. The teachings of Sant Mat are primarily transmitted through oral tradition, with the guru passing down the knowledge and practices to their disciples.

While there is no single specific text or scripture that is considered the ultimate authority in Sant Mat, there are a few key texts that are widely used and revered by followers of this path. These texts are considered to be the source of spiritual wisdom and guidance for practitioners of Sant Mat.

One of the most important texts in Sant Mat is the Guru Granth Sahib, also known as the Adi Granth. It is the central religious scripture of Sikhism, but it is also considered a sacred text by followers of Sant Mat. The Guru Granth Sahib contains the teachings of the ten Sikh gurus, as well as the writings of various saints and mystics from different spiritual traditions, including Sant Mat.

Another important text in Sant Mat is the Sar Bachan, which means "words of truth." It is a collection of spiritual discourses by the 19th-century Sant Mat master, Soami Ji Maharaj. The Sar Bachan is considered to be a comprehensive guide to spiritual practice and contains teachings on meditation, karma, and the nature of the soul.

The Anurag Sagar, also known as the Ocean of Love, is another important text in Sant Mat. It is a poetic composition by the 19th-century mystic, Kabir. The Anurag Sagar is a spiritual allegory that describes the journey of the soul from its origin to its ultimate union with the Divine.

Apart from these key texts, there are also other Sant Mat scriptures that are considered important by different branches and lineages within the tradition. These include the Radhasoami Mat Prakash, the Sar Shabdavali, and the Sar Updesh.

In addition to these texts, Sant Mat also places great importance on the practice of meditation and the repetition of sacred mantras or names of God. These practices are considered essential for spiritual growth and are taught by the guru to their disciples.

In conclusion, while there is no single specific text or scripture that is considered the ultimate authority in Sant Mat, there are several key texts that are widely used and revered by followers of this path. These texts, along with the guidance of a living spiritual teacher, serve as a source of spiritual wisdom and guidance for practitioners of Sant Mat on their journey towards self-realization and union with the Divine.