All warfare is based on deception. Hence, when able to attack, we must seem unable; when using our forces, we must seem inactive; when we are near, we must make the enemy believe we are far away; when far away, we must make him believe we are near.

He who is prudent and lies in wait for an enemy who is not, will be victorious.

Pretend to be weak, so your enemy may grow arrogant.

Sun Tzu