If the enemy thinks of the mountains, attack like the sea; and if he thinks of the sea, attack like the mountains.

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.

Do nothing which is of no use.

I dreamt of worldly success once.

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.

Know your enemy, know his sword.

When you have attained the way of strategy there will be nothing that you cannot understand. You will see the way in everything.