The Heart Sutra is a revered text in Mahayana Buddhism. It is a short text that condenses central teachings in Buddhism. In the text, Avalokitesvara Bodhisattva, in Japan also known as Kannon Bosatsu, speaks to Shariputra, who was an important disciple of the historical Buddha. The Bosatsu describes the non-substantiality, emptiness or boundlessness of all phenomena. A main message is that everything is impermanent and interdependent.