Aiki (martial arts principle) and its practice is often kept within a particular individual or two from a family/school lineage. Culturally, and due to certain necessities of the time period, the aiki knowledge was usually a very well guarded secret and rarely disclosed. The oldest book to have historically discuss aiki was the 1899 Budo Hiketsu-Aiki no Jutsu. On the subject of aiki it was written: The Textbook of Jujutsu (Jujutsu Kyoju-sho Ryu no Maki) from 1913 wrote: Aiki (martial arts principle) Aiki from a Japanese budo term, at its most basic is a principle that allows a conditioned practitioner to negate or redirect
What Is Life "Close to the Edge", "Mojo", December 2003, p. 82.</ref> It was while driving up to a Preston session in London from his home in Esher, Surrey, that Harrison came up with the song "What Is Life". In his autobiography, "I, Me, Mine", Harrison describes it as having been written "very quickly" and recalls that he thought it would be a perfect, "catchy pop song" for Preston to record. His lyrics, while simple, were similarly uplifting and universal: These lyrics have caused some debate among biographers and music critics, as to whether "What Is Life" should be viewed as a straightforward