Concentrate your energy and hoard your strength.
If you know both yourself and your enemy, you can win a hundred battles without a single loss.
Therefore, just as water retains no constant shape, so in warfare there are no constant conditions.
He will win who knows how to handle both superior and inferior forces.
If this is long delayed, weapons are blunted and morale depressed.
Those skilled at making the enemy move do so by creating a situation to which he must conform; they entice him with something he is certain to take, and with lures of ostensible profit they await him in strength.