In contests of strategy it is bad to be led about by the enemy. You must always be able to lead the enemy about.

There are many ways of understanding simple things, but generally the opposite is true for difficult ideas

If you fail to take advantage of your enemies' collapse, they may recover.

You should not have any special fondness for a particular weapon, or anything else, for that matter. Too much is the same as not enough. Without imitating anyone else, you should have as much weaponry as suits you.

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.

Do not regret what you have done

Do not act following customary beliefs.