The words of my perfect teacher by Patrul Rinpoche is a classic commentary on the preliminary practices of the Longchen Ñingtig ("The essence of the heart of the vast space"), one of the best-known teaching cycles and a spiritual treasure (terma) of the school Ñingmapa, the oldest tradition of Tibetan Buddhism. It is considered by many teachers of all schools as a supreme guide, at the same time deep, full of life and detailed, of all the preliminary practices and, in a more general way, as a fundamental teaching about the Vehicle of the Secret Mantras, which exposes the essential in a clear and simple way. The direct and familiar style, and the great variety of quotations, anecdotes and proverbs that accompany each important idea avoid the monotony of the classic exhibitions. The constant reference to lived experiences denounces the futility of purely intellectual approaches and leads to see the authentic practice of Buddhism as a true inner transformation.