Go rin no sho is awesome! It's a little difficult to understand, particularly if you've never sparred with weapons. A few favorite quotes regarding this topic:
"Spiritual Bearing in Strategy
In strategy your spiritual bearing must not be any different from normal. Both in fighting and in everyday life you should be determined though calm. Meet the situation without tenseness yet not recklessly, your spirit settled yet unbiased. Even when your spirit is calm do not let your body relax, and when your body is relaxed do not let your spirit slacken. Do not let your spirit be influenced by your body, or your body be influenced by your spirit. Be neither insufficiently spirited nor over spirited. An elevated spirit is weak and a low spirit is weak. Do not let the enemy see your spirit."
"When you take up a sword, you must feel intent on cutting the enemy....whatever attitude (stance) you are in, do not be conscious of making the attitude; think only of cutting.....the primary thing when you take a sword in your hands is your intention to cut the enemy, whatever the means. Whenever you parry, hit, spring, strike or touch the enemy's cutting sword, you must cut the enemy in the same movement. It is essential to attain this. If you think only of hitting, springing, striking or touching the enemy, you will not be able actually to cut him. More than anything, you must be thinking of carrying your movement through to cutting him. You must thoroughly research this."
"Direct Communication
The spirit of "Direct Communication" is how the true Way of the Ni To Ichi school is received and handed down.
Oral tradition: 'Teach your body strategy.'"
"In single combat you must not fix the eyes on the details. As I said before, if you fix your eyes on details and neglect important things, your spirit will become bewildered, and victory will escape you. Research this principle well and train diligently."
Check out:
To Hold Down a Pillow
To Release Four Hands
To Move the Shade
The Mountain-Sea Change
Enjoy!