Many of these martial art quotes are from Sun Tzu The Art of War

All warfare is based on deception. Therefore, when capable, feign incapacity;when active, inactivity. When near, make it appear that you are far away;when far away, that you are near.

When he concentrates, prepare against him; where he is strong, avoid him.

Pretend inferiority and encourage his arrogance.

Keep him under strain and wear him down.

For to win one hundred victories in one hundred battles is not the acme of skill. To subdue the enemy without fighting is the acme of skill.

Thus, what is of supreme importance in war is to attack the enemy's strategy;...

Thus, those skilled in war subdue the enemy's army without battle. They capture his cities without assaulting them and overthrow his state without protracted operations.

He who knows when he can fight and when he cannot will be victorious.

Know thy enemy and know yourself; in a hundred battles you will never be in peril.

Anciently the skillful warriors first made themselves invincible and awaited the enemy's moment of invulnerability.

Generally, in battle, use the normal force to engage; use the extraordinary to win.

When the torrential water tosses boulders, it is because of momentum;... when the strike of a hawk breaks the body of its prey, it is because of timing.