Cheng weishi lun

Cheng Weishi Lun (Chinese: 成唯識論; pinyin: Chéng Wéishì Lùn) or Discourse on the Perfection of Consciousness-only, is a comprehensive discourse on the central teachings of Yogacara framed around Vasubandhu's seminal Yogacara work, Triṃśikā-vijñaptimātratā (Thirty Verses on Consciousness-only). It was written by the Chinese monk Xuanzang in the 7th century CE. It is sometimes referred to as Vijñaptimātratāsiddhi, its equivalent name in Sanskrit.

When Xuanzang was studying Buddhism in India at Nālandā University, he discovered ten commentaries on Vasubandhu's Triṃśikā-vijñaptimātratā. He drew upon these commentaries, especially the commentary of Dharmapāla, when writing his own detailed explanation of the Triṃśikā-vijñaptimātratā, which became the Cheng Weishi Lun.

The Cheng Weishi Lun became one of the key texts of East Asian Yogācāra, both by Chinese ("Faxiang") and Japanese ("Hossō") thinkers.

Wei Tat translated the Cheng Weishi Lun into English for the first time in Hong Kong in 1973. This translation is based upon Louis de La Vallée-Poussin's early translation into French (Vijñaptimātratāsiddhi: La Siddhi de Hiuan-Tsang). Wei's translation is now out of print and difficult to find. More recently, Francis Cook made a new English translation of the text for the Numata Center for Buddhist Translation and Research's Taishō Tripiṭaka translation effort.

To date, the following English translations of the Cheng Weishi Lun have been rendered:

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