Tib., bi ma la mi tra, bi ma la
An 8th century Indian adept also known as the "Sage of Kashmir", although he traveled and lived just as much in China, Uddiyana and Tibet. He was a student of Sri Singha and Buddhaguhya, and later became an important teacher within the lineages of the Nyingmapa and Dzogchen traditions.
Vimalamitra united two aspects the Nyingtig teachings: the explanatory lineage with scriptures, and the hearing lineage without scriptures - and concealed them to be revealed as the Vima Nyingtig, and also as the Secret Heart Essence of Vimalamitra (bi ma'i gsang ba snying thig).
Vimalamitra also translated, together with Ma Rinchen Chok, important Nyingma texts such as the Guhyasamaja Tantra and the Guhyagarbha (Tib., gSang-ba snying-po, The Secret Heart, or Essence of Secrets).