Once when a number of men had gathered on the platform of the inner citadel of the castle, a certain man said to Uchida Shoemon, "It is said that you are a teacher of the sword, but judging by your everyday attitude, your teaching must be very wild indeed. If you were requested to perform kaishaku, I can imagine that instead of cutting the neck you'd probably cut the top of the man's head."
Shoemon rejoined, "Such is not the case. Draw a little ink spot on your own neck, and I'll show you that I can cut without being off by a hair."
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From William Scott Wilsons translation of 'Hagakure' by
Yamamoto Tsunetomo. Chapter 8.
"I am sure many of you are conversant with this excellent book but I hope you enjoy this anyway"
Ed Tree