Personal memoirs are not uncommon in Tibetan Buddhism, but A Clear Mirror offers an unusual variation: three levels of spiritual teachings, conveying outer, inner, and subtle aspects of wisdom, that give readers full access to the rich life of one of Vajrayana Buddhism’s most respected figures. Dudjom Lingpa (1835–1904) was a Tibetan visionary and Great Perfection master, or tertön , a revealer of spiritual treasures called terma hidden in the Earth and in the minds of disciples. Dujdom Lingpa is renowned for his revelations on “refining perception” or Nang Jang, and, through dream yoga, trance, and visions, for transmitting the “mindstream” of a number of enlightened spiritual beings, such as Sri Singha, Saraha, Vajradhara, and Manjushri, whose wisdom he received and shares in this book.