Hence the saying: One may know how to conquer without being able to do it.

Hence that general is skilful in attack whose opponent does not know what to defend; and he is skilful in defense whose opponent does not know what to attack.

Therefore, just as water retains no constant shape, so in warfare there are no constant conditions.

Should the enemy forestall you in occupying a pass, do not go after him if the pass is fully garrisoned, but only if it is weakly garrisoned.

When strong, avoid them. If of high morale, depress them. Seem humble to fill them with conceit. If at ease, exhaust them. If united, separate them. Attack their weaknesses. Emerge to their surprise.

What is of the greatest importance in war is extraordinary speed: One cannot afford to neglect opportunity.

Unless you enter the tiger's lair, you cannot get hold of the tiger's cub's.