..by combining a certain state of mind and rhythm with focused power, what you get is kokyu power.
What I mean precisely by “state of mind” is that you have to achieve a state of emptiness, or nothingness….then you will start to have complete faith in yourself and you will achieve a state of serenity.
Once this happens, you will be able to read the movements of your opponent’s mind. You won’t perceive how he is going to advance in your head, you’ll sense it in your skin. It will be as if the so-called “mind’s eye” or sixth sense is at work.
– – – Gozo Shioda Shihan, Aiki Shugyo p. 92