Nothing is more difficult than the art of maneuvering for advantageous positions.

With regard to precipitous heights, if you are beforehand with your adversary, you should occupy the raised and sunny spots, and there wait for him to come up.

In warfare, there are no constant conditions. He who can modify his tactics in relation to his opponent will succeed and win.

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.

Of all rewards none [is] more liberal than those given to secret agents.

To plan secretly, to move surreptitiously, to foil the enemy's intentions and balk his schemes, so that at last the day may be won without shedding a drop of blood.

Like the sun and moon, they end but to begin anew; like the four seasons, they pass away to return once more.