Sun Tzu, The Art of War
“A quick temper makes a fool.”

“Impulsive men can be provoked to rage and brought to defeat.”
 
“One easily angered is obstinate and hasty - he does not consider difficulties.”

“One anxious to defend his reputation pays no regard to anything else."

W.K. Luck
“Be alert, be wise, be ready, be brave. These are the rules of self-defense..."

John Kyle, American Karate
“1. Know what you want, 2. Have a plan, 3. Ask a teacher to help, 4. Take consistent action, 5. Review and renew your goal.”