Against those skilled in attack, an enemy does not know where to defend; against the experts in defense, the enemy does not know where to attack.

Keep their friends close and their enemies closer.

If I am able to determine the enemy's dispositions while at the same time I conceal my own, then I can concentrate and he must divide.

So the principles of warfare are: Do not depend on the enemy not coming, but depend on our readiness against him. Do not depend on the enemy not attacking, but depend on our position that cannot be attacked.

It is more important to outhink your enemy, than to outfight him