When thou perceivest that discord is in the army of the foe, be thou at ease; but if they are united, be apprehensive of thy own distress.
Go and sit in repose with thy friends
When thou seest war among the enemies;
But if thou perceivest that they all agree
Span thy bow and carry stones upon the rampart.
Saadi Shirazi
http://www.poemhunter.com/poem/ch-08-on-rules-for-conduct-in-life-admonition-12/
