Thus, though I have heard of successful military operations that were clumsy but swift, cleverness has never been seen associated with long delays.

If I am able to determine the enemy's dispositions while at the same time I conceal my own, then I can concentrate and he must divide.

A clever general... avoids an army when its spirit is keen, but attacks it when it is sluggish and inclined to return. This is the art of studying moods. Disciplined and calm, he awaits the appearance of disorder and hubbub among the enemy. This is the art of retaining self-possession.

Spies cannot be usefully employed without a certain intuitive sagacity.

Bring war material with you from home, but forage on the enemy... use the conquered foe to augment one's own strength.

What the ancients called a clever fighter is one who not only wins, but excels in winning with ease.

The Art of War is self-explanatory