The Gandavyhua Sutra or Sutra of the Entry into the Realm of Reality is a Buddhist Sutra

Sutra

Sūtra is an aphorism or a collection of such aphorisms in the form of a manual. Literally it means a thread or line that holds things together and is derived from the verbal root siv-, meaning to sew , as does the medical term...

 of Indian origin that records one the world's most celebrated spiritual pilgrimage

Pilgrimage

A pilgrimage is a journey or search of great moral or spiritual significance. Typically, it is a journey to a shrine or other location of importance to a person's beliefs and faith...

s, and comprises the 39th chapter of the Flower Garland Sutra. The sutra chronicles the journey of a disciple, Sudhana, as he encounters various teachings and Bodhisattvas until his journey reaches full circle and he awakens to teachings of the Buddha.