SEI SHIN - Seishin, means many things: Cultivation of the mind, putting ones heart and soul into the effort, sincerely devoting ones self, mentally, physically, spiritually and morally to your art. There are two sayings related to Seishin which reinforces this ideology.
Seishin Tanren Forging the Spirit, man's attempt for perfection. Cultivation of the mind, putting ones heart and soul into all endeavours, sincerely devoting ones self, physically, mentally, spiritually and morally to your art. Osu No Seishin a shortening becomes, Osu. This derives from Oshishinobu, which means to persevere while under pressure therefore we see strength of character development through hard training. In other words our motivation to train should not be simply to gain physical strength in order to dominate others and feed our egos but to keep an open mind, to lear and grow, so that we may become a better person