The end and aim of spying in all its five varieties is knowledge of the enemy; and this knowledge can only be derived, in the first instance, from the converted spy. Hence it is essential that the converted spy be treated with the utmost liberality.

So it is that good warriors take their stance on ground where they cannot lose, and do not overlook conditions that make an opponent prone to defeat.

Know thy self, know thy enemy. A thousand battles, a thousand victories.

Management of many is the same as management of few. It is a matter of organization.

Making no mistakes is what establishes the certainty of victory, for it means conquering an enemy that is already defeated.

Pretend to be weak, so your enemy may grow arrogant.

On the field of battle, the spoken word does not carry far enough; hence the institution of gongs and drums... banners and flags. Gongs and drums, banners and flags, are means whereby the ears and eyes of the host may be focused on one particular point.