Ushiwaka single-handedly routed the great number of the bandits in battle and slew Kumasaka. For many years he has devoted himself to the teachings of the saints and the sages and has been deeply concerned about those who practise the martial arts. The quality of his Life Force surpasses that of most master swordsmen who enjoy the world's recognition. 'Swordsmanship is the natural reaction of the Heart, in retreat without form and in approach without a trace. The infinity of heaven and earth, the brightness of the sun and the moon, the coming and going of heat and cold with the change of the four seasons, the birth and death of all things in the world all of these phenomena are nothing more than the interplay of yin and yang. The movement of the Heart which is caused by its encounter with things is called emotion. The transiency of observations is called thought.