By Jikishin Kobudo, Jun 22 2016 11:37AM
The 'Shin' ideogram is drawn to represent the heart, the lines drawn show the ventricles and where the blood travels. For martial artists in days gone by your spirit is considered to be held within your blood. At one time the whole world agreed on that. However modern science and the 'ologies have yet to explain such a concept in definitive terms and so the ordinary science fearing child of the modern world finds talk of 'spirit' uncomfortable and mystical. So perhaps talk of lymphocytes, globulins and basophils may have to enter future dojos so that modern students can understand how the heart defines/reflects the character of the person.