He who knows his enemy and himself well will not be defeated easily.
When he utilizes combined energy, his fighting men become as it were like unto rolling logs or stones. For it is the nature of a log or stone to remain motionless on level ground, and to move when on a slope; if four-cornered, to come to a standstill, but if round-shaped to go rolling down.
The nature of war is constant change.
So the important thing in a military operation is victory, not persistence.
Pretend inferiority and encourage his arrogance.
He who is prudent and lies in wait for an enemy who is not, will be victorious.