This 'Quintessence of Secret (Esoteric) Buddhism' is the combination of the first and second volumes of the previous 'Essence of Secret Buddhism', which were published in the United States in the past two years (1983). It is supplemented with new documents about mystic formulas, Yantras, and Mudras, allowing further studies in Secret Buddhism.
Readers are invited to understand and experience the magic and the value of mystic formulas and rituals. The degree of success depends upon the level of one's merits and virtues. Secret Buddhism already has its many wonderful legends in many countries in Asia, so that there is no need to praise it further. It is time for all opinions about the supernatural power and secret doctrine to be presented to humanity like any other science. We invite any skeptical person to try it out before commenting about it.
I would like to extend my appreciation to friends in Secret Buddhism who have provided me favorable conditions to practice this religion in the past three years in the United States, Canada and eventually in other countries in the future.
COLORADO, JUNE 6, 1985 Author: Trieu Phuoc Religious name: Duc Quy
The author was born in Vietnam (1948). By the age of 30 he propagated Mat Tong. He resettled in the USA in 1981.
The book is a good overview on what the author considers "Secret Buddhism", which implies the role of the five Dhyani Buddhas.
(Yantra, Five Buddhas at the five corners of the universe)
An historical perspective about Buddhism expansion throughout the East, and the Southeast (Cambodia and Vietnam...) is approached.
What struck me the most was the abundance of yantras, mudras, mandalas and seals under consideration, and the yantras "techniques". Also the practice of the five essential dharanis.
I would pick three yantras for year 2021, those used "to cure all bodily diseases" from Ji' the Old Immortal at TaiChi palace of the late Han dynasty.