Know the enemy and know yourself; in a hundred battles you will never peril.
The opportunity of defeating the enemy is provided by the enemy himself.
Know thy enemy and know thy self and you will win a hundred battles.
Do not swallow bait offered by the enemy. Do not interfere with an army that is returning home.
Now an army is exposed to six several calamities, not arising from natural causes, 1 but from faults for which the general is responsible. These are: (1) Flight; (2) insubordination; (3) collapse; (4) ruin; (5) disorganisation; (6) rout.
Humble words and increased preparations are signs that the enemy is about to advance. Violent language and driving forward as if to the attack are signs that he will retreat.