Who Wishes To Fight Must First Count The Cost

He will win who knows when to fight and when not to fight

To win one hundred victories in one hundred battles is not the acme of skill. To subdue the enemy without fighting is the acme of skill.

Move not unless you see an advantage; use not your troops unless there is something to be gained; fight not unless the position is critical.

If you know the enemy and know yourself, you need not fear the result of a hundred battles. If you know yourself but not the enemy, for every victory gained you will also suffer a defeat. If you know neither the enemy nor yourself, you will succumb in every battle.

Be kind, for everyone you meet is fighting a hard battle.

If your opponent is of choleric temper,  seek to irritate him.  Pretend to be weak, that he may grow arrogant.