If we know that the enemy is open to attack, and also know that our men are in a condition to attack, but are unaware that the nature of the ground makes fighting impracticable, we have still gone only halfway towards victory. 563

Hence the experienced soldier, once in motion, is never bewildered; once he has broken camp, he is never at a loss. 564

Hence the saying: If you know the enemy and know yourself, your victory will not stand in doubt; 565 if you know Heaven and know Earth, 566 you may make your victory complete. 567