The science of breath is only transmitted by word of voice from the teacher when he sees someone worthy to learn. There are three stages: Jelal, force of breath; Jemal, the gentleness of breath; Kemal, perfection of breath. The latter stage culminates in miracles. A book is a dead teacher. People continually send their breath into undesirable centers. It is essential to have a living guide, and not to try and study from books.