This sourcebook offers a systematic presentation of the Mind Only (Cittamātra) tenet system, one of the principal Mahāyāna philosophical schools. The Mind Only school emphasizes the doctrine that the subjective and objective poles of perception are not different in substance, but mental in nature. Specific topics include discussions on perception, the fundamental notion of “mind only,” the three natures, self-awareness, and the all-base consciousness. Also included is a brief discussion of the paths and the fruition. Selected readings, analytical meditations, study questions, and review charts are included in the sourcebook. Includes root text written by Acharya Lama Tenpa Gyaltsen.