" The Arab conquest was not only a matter of military domination. It was not like the Mongol invasion. The Mongols invaded Iran, but Iran did not become Shamanist or Buddhist. Some people say that the Arab invasion was just a military conquest, but this is not so. Rather, it was accompanied by a profound spiritual transformation that took place wherever Muslims went and settled down. "

― Seyyed Hossein Nasr , در جست‌وجوی امر قدسي