The secret of this is to be learnt in the science of breath. Breath is the essence of life, the center of life, and the mind may be controlled by a knowledge of the proper method of breathing. For this, instruction from a teacher is a necessity; for since the mystical cult of the East has become known in the West books have been published, and teaching which had been kept as sacred as religion has been discussed in words; but these can never truly explain the mystery of that which is the center of man's very being.