Bring war material with you from home, but forage on the enemy... use the conquered foe to augment one's own strength.
Sun TzuDon't flail against the world, use it. Flexibility is the operative principle in the art of war.
Sun TzuBy altering his arrangements and changing his plans, the skillful general keeps the enemy without definite knowledge. By shifting his camp and taking circuitous routes, he prevents the enemy from anticipating his purpose. At the critical moment, the leader of an army acts like one who has climbed up a height and then kicks away the ladder behind him.
Sun Tzu