The principle of maximum efficient use of mind and body means to apply all spiritual, as well as physical, energy effectively to obtain the best results. The second principle is related to the social order and harmony of society in daily life by "mutual welfare and benefit". Dr. Kano's aim in Judo was to teach these two principles so that both the individual and the society, as a whole, would be able to achieve the highest social and technical advancement, develop strong healthy bodies, and learn to protect themselves from accidents or enemies.