Go into emptiness, strike voids, bypass what he defends hit him where he does not expect you.

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

Know thy self, know thy enemy.

Ponder and deliberate before you make a move.

Winning Strategists are certain of triumph before seeking a challenge. Losing Strategists are certain to challenge before seeking a triumph.

So the important thing in a military operation is victory, not persistence.

In your deliberations, when seeking to determine the military conditions, let them be made the basis of a comparison, in this wise: which of the two generals has the most ability? on which side is Discipline most rigorously enforced? which army is stronger? on which side are the officers and men more highly trained? in which army is there the greater constancy both in reward and punishment?