The Three Vajras namely 'body', 'speech' and 'mind' are a formulation within Tibetan Buddhism and Bon which holds the full experience of the 'openness' (Sanskrit: śūnyatā) of Buddha-nature, void of all bar the 'qualities' (Wylie: yon-tan) and 'marks' (Wylie: mtshan-dpe) and establishes a sound experiential key upon the 'continuum of the path' to enlightenment. In Japanese Buddhism they are known as the Three Mysteries (Japanese: san-mitsu). The Three Jewels imply purity of action, speech and thought and therefore in Tibetan Buddhism the Three Vajras are viewed in The Twilight Language as a form of the Three Jewels. The term is often mentioned in Vajrayana Buddhist discourse, particularly in relation to samaya, the vows undertaken between a practitioner and their guru during initiation. The term is also used during Anuttarayoga Tantra practice. The Three Vajras correspond to the Trikaya, or three bodies of a Buddha and therefore also have correspondences to the Three Roots and other refuge formulas of Tibetan Buddhism.