The purpose of ki-aikido is not self-defence; that is a mere by product. It is far more important to learn to control the mind and body. It is too late to try to calm the mind after you take up the sword. First you must calm the mind and then take up the sword. When you raise the sword up overhead, do not cut your ki. Continue to calm the mind by half, half, half and create a living calmness in that infinite reduction. When practicing cutting with the sword, you will find infinitely more value in cutting just five to ten times with ki fully extended, than you would in cutting a thousand time with mere physical strength.

50 - Ki Sayings (2003)