First learn to become invincible, then wait for your enemy's moment of vulnerability.

Do not swallow bait offered by the enemy. Do not interfere with an army that is returning home.

It is only one who is thoroughly acquainted with the evils of war that can thoroughly understand the profitable way of carrying it on.

The successful person has unusual skill at dealing with conflict and ensuring the best outcome for all.

If a battle can not be won do not fight it.

Therefore, just as water retains no constant shape, so in warfare there are no constant conditions.

Know the enemy and know yourself.