If you know both yourself and your enemy, you can win a hundred battles without a single loss.
If our soldiers are not overburdened with money, it is not because they have a distaste for riches; if their lives are not unduly long, it is not because they are disinclined to longevity.
Pretend inferiority and encourage his arrogance.
Who can determine where one ends and the other begins?
A warrior who is prepared to fight must also be prepared to die.
Those who excel in war first cultivate their own humanity and and maintain their laws and institutions. By these means they make their governments invincible.