THE FUNDAMENTAL idea running through the whole of this surah is man's inability ever to encompass the mysteries of the universe with his earthbound knowledge, and, hence, his utter dependence on guidance through divine revelation. Best known by the key-word al-mulk ("dominion") taken from its first verse, the surah has sometimes been designated by the Companions as "The Preserving One" (Al-Waqiyah) or "The Saving One" (Al-Munjiyah) inasmuch as it is apt to save and preserve him who takes its lesson to heart from suffering in the life to come (Zamakhshari).