Becoming the opponent means you should put yourself in an opponent's place and think from the opponent's point of view.

In my school, no consideration is given to anything unreasonable; the heart of the matter is to use the power of the knowledge of martial arts to gain victory any way you can.

There was no such thing as a fair fight. All vulnerabilities must be exploited.

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.

It is difficult to realize the true Way just through sword-fencing. Know the smallest things and the biggest things, the shallowest things and the deepest things.

No man is invincible, and therefore no man can fully understand that which would make him invincible