There is no place where espionage is not possible.

The general who advances without coveting fame and retreats without fearing disgrace, whose only thought is to protect his country and do good service for his sovereign, is the jewel of the kingdom.

For them to perceive the advantage of defeating the enemy, they must also have their rewards.

Hold out baits to entice the enemy. Feign disorder, and crush him.

Now a soldier's spirit is keenest in the morning; by noonday it has begun to flag; and in the evening, his mind is only on returning to camp.

If their forces are substantial, prepare for them; if their forces are strong, avoid them.

Unless you know the mountains and the forests, the defiles and impasses, the lay of the marshes and swamps, you cannot maneuver with an armed force. Unless you use local guides, you cannot get the advantages of the land.