Do not regret what you have done

True warriors are fierce because their training is fierce.

It is imperative to master the principles of the art of war and learn to be unmoved in mind even in the heat of the battle.

Become acquainted with every art.

Perceive that which cannot be seen with the eye.

In the construction of houses, choice of woods is made. Straight un-knotted timber of good appearance is used for the revealed pillars, straight timber with small defects is used for the inner pillars. Timbers of the finest appearance, even if a little weak, is used for the thresholds, lintels, doors, and sliding doors, and so on. Good strong timber, though it be gnarled and knotted, can always be used discreetly in construction.

When you attack the enemy, your spirit must go to the extent of pulling the stakes out of a wall and using them as spears and halberds.