Throughout the history of mankind there have been healings based on the event and/or on the transmission of universal vital energy, able to penetrate all, of a force able to produce and maintain all forms of life in the universe.
The Tibetans had, for example, a deep understanding about the being of the spirit, of matter and energy, already thousands of years ago. They used this knowledge to heal their body, to harmonize their soul and spirit to bring your own experience of the unit. We also find that knowledge in India, in modified forms in Japan, China, ancient Egypt, Greece, during the Roman Empire and other countries.
This knowledge has been protected and preserved in all of the "Mystery Schools" of almost every culture in its entirety and accessible only to a few insiders. Generally these knowledge were handed down orally, and most of the times to only one pupil. Much of the knowledge of the past is lost for this reason.
The same happened with Reiki, had been lost. At the end of the nineteenth century
Dr. Mikao Usui, in constant search of himself, and through meditation, he discovered the keys again, which again made possible the application of this ancient knowledge of natural healing.
The word Reiki stands for Universal Life Energy. It is defined as the force that works and lives in all things. The word consists of two parts. The syllable REI describes the boundless universal aspect of this energy.
The Ki is the life force that flows through all living things.