If you only do the martial side of karate its like walking on one leg if you only do the spiritual side its like walking on the other a good sensai teaches you how to walk on both legs and you learn karate till you die even grand master Kanazawa is still learning new things well the only thing i can say to that is if you do karate till you die you'll live longer... my sensai will be leaving my club soon , when i found out about it I nearly fell down it's disheartening for such a great teacher a friend even to have to leave but alas I can't change fate. I hope to take over the club someday and I won't stop training and I wont stop teaching till I can't make a fist anymore.