Who does not know the evils of war cannot appreciate its benefits.
If a battle can not be won do not fight it.
Know the enemy and know yourself.
Know thy enemy and know thy self and you will win a hundred battles.
A clever general... avoids an army when its spirit is keen, but attacks it when it is sluggish and inclined to return. This is the art of studying moods. Disciplined and calm, he awaits the appearance of disorder and hubbub among the enemy. This is the art of retaining self-possession.
A sovereign of high character and intelligence must be able to know the right man, should place the responsibility on him, and expect results.