I agree with fed. The katana is like the hand gun. It is a horrible device, invented for the sole purpose of killing other humans. We had a case here in NZ a few years back where a guy on meth used a katana to murder another guy and then cut off the hands of two women he kidnapped. Horrible! If you want to enter some kind of discipline to achieve the 'mastery' you profess to espouse, there are many that are non violent. Yoga, or Tai Chi etc.