They [spies] cannot be properly managed without benevolence and straightforwardness.
Great results, can be achieved with small forces.
A wise general makes a point of foraging of the enemy.
And therefore those skilled in war bring the enemy to the field of battle and are not brought there by him.
Hostile armies may face each other for years, striving for the victory which is decided in a single day. This being so, to remain in ignorance of the enemy's condition simply because one grudges the outlay of a hundred ounces of silver in honors and emoluments, is the height of inhumanity.
To ... not prepare is the greatest of crimes; to be prepared beforehand for any contingency is the greatest of virtues.