“13. Hence those who use fire as an aid to the attack show intelligence; those who use water as an aid to the attack gain an accession of strength.
14. By means of water, an enemy may be intercepted, but not robbed of all his belongings.
15. Unhappy is the fate of one who tries to win his battles and succeed in his attacks without cultivating the spirit of enterprise; for the result is waste of time and general stagnation.
16. Hence the saying: The enlightened ruler lays his plans well ahead; the good general cultivates his resources.
17. 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.
18. No ruler should put troops into the field merely to gratify his own spleen; no general should fight a battle simply out of pique.
19. If it is to your advantage, make a forward move; if not, stay where you are.
20. Anger may in time change to gladness; vexation may be succeeded by content.
21. But a kingdom that has once been destroyed can never come again into being; nor can the dead ever be brought back to life.
22. Hence the enlightened ruler is heedful, and the good general full of caution. This is the way to keep a country at peace and an army intact.”
Sun Tzu, Master Sun
Art of War
Quoted in The Art of War, Translated by Lionel Giles, Offered by The Project Gutenberg eBook

Use intelligence
Diversify your attack
Your force needs guidance
Remember to backtrack

Plan ahead
Avoid bloodshed

Move on benefits
Fight for profits

Never fight out of fury
Nor out of pride
Emotions are unsteady
Emotionless decides

Be heedful
Be careful