The origins of Reiki are somewhat mysterious, and much of the information that is available about Reiki is either contradictory or not validated by historical reference. What most sources seem to agree upon is this:
Late in the nineteenth century, Mikao Usui, a Japanese scholar, began an intensive study of energetic healing and spiritual practices. His quest led him to research Sanskrit texts created by Tibetan monks over the course of many centuries. Usui recovered sacred symbols and mantras.
A key part of Usui’s learning was a mystical experience he encountered upon completing a 21 day fast and meditation on Mount Kurama in Japan. He saw a shining light that struck him at his third eye. Usui found himself in a state of expanded consciousness where he could see energy in the form of bubbles of rainbow colored light.
Ultimately, in another bright light, he recognized the symbols that he had been studying from the Sanskrit texts glowing in golden light. Simultaneously the meaning and purpose for the symbols became clear to him.
Upon descending the mountain in his greatly expanded state Usui stubbed his toe causing it to bleed and throb. He held his hands around his foot and the bleeding and pain stopped immediately. This was a validation of the powerful healing force that he was charged with.
Mikao Usui worked for seven years healing in the slums of Kyoto. He became discouraged that though he could heal peoples physical bodies, they remained trapped in their patterns recreating disease. He created the Reiki principles.
Usui realized that in order for someone to heal they must first want the healing and then ask for it. He also recognized that there must be some form of exchange of energy between healer and receiver. He realized that payment is necessary.
Ultimately, Mikao Usui trained over 2000 practitioners before he died in 1926. At least 16 of those practitioners he trained as Reiki Masters. Dr. Chujiro Hayashi, one of those Reiki Masters, utilized Reiki at his three healing clinics in Japan. The practice of Reiki moved to the west when Mrs. Hawayo Takata from Hawaii received Reiki training from Dr. Hayashi.