وَأَطِيعُوا اللَّهَ وَرَسُولَهُ وَلَا تَنَازَعُوا فَتَفْشَلُوا وَتَذْهَبَ رِيحُكُمْ ۖ وَاصْبِرُوا ۚ إِنَّ اللَّهَ مَعَ الصَّابِرِينَ

Yusuf Ali translation
"And obey Allah and His apostle; and fall into no disputes lest ye lose heart and your power depart; and be patient and persevering: for Allah is with those who patiently persevere."
- Surah 8. Al-Anfal, Ayah 46

Note: A fine description of the Muslim virtues which make for success and whose loss brings about humiliation and failure. "Power": literally, "wind",-the favourable wind for a sailing ship

- See more at: http://www.alim.org/library/quran/ayah/compare/8/46/order-of-allah-to-remain-firm-during-combat-against-enemy#ayanote-1215