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Mizo no Kokoro
A mind like water (mizo no kokoro): Smooth water reflects accurately the image of all objects within its range. If the mind is kept in this state, one's responses, both defensive and offensive, will be appropriate and accurate. If the surface of the water is disturbed, the images will be distorted. Like the mind, if it is preoccupied with thought of attack or defense, it will not apprehend the opponent's intentions, creating an opportunity for the opponent to attack.
In Isshinryu Karate Do, the symbol of the Goddess, Megami uses water to teach this timeless concept. She calms the waters of disturbance which come from the winds of external storm. She also calms the waters of anxiety, anger and fear which come from the internal state of the self (in this instance represented by the lower half of her body as a writhing serpent.)
Mizo no Kokoro is the sense of inner stillness which must pervade all of the behaviors which a karateka performs regardless of the external or internal exigencies.
Rokudan, Isshinryu Karate Do, Renshi, OKF