Overview (Verse 30)

The surah ends with a note that mentions punishment in this present life in the form of depriving the unbelievers of the most essential thing of life, namely, water:

Say: Just think: if all your water were to sink underground, who would give you clear flowing water? (Verse 30)

This is something so close and necessary for people's lives. They should therefore consider this move carefully if they cannot think of the Day of Judgement as certain. All dominion rests in God's hand and He is able to accomplish anything. What will their position be should He will that they be deprived of this most essential life element? They are left to contemplate this unthinkable eventuality, should God will it to happen.
 
Thus, this surah concludes, having taken us on a grand tour reaching up to great horizons and profound depths. Almost every verse provides a distinct beat. It can be seen as a journey into the unknown, or indeed into a close, visible world that is often overlooked. It is a grand surah, much greater than its length or the number of its verses. It is like arrows pointing far into the distance, with each aiming at a separate world.

The surah addresses a number of very important Islamic concepts. It establishes the truth of God's absolute power and His absolute sovereignty; the trial of death and life as a prelude to resurrection and requital; the beauty and perfection of God's design; His absolute knowledge of secrets and inner thoughts: of God being the source of all provisions; of His guardianship of all His creatures; of His presence with every creature, as well as a number of other truths that are part of a believer's concept of God, the universe and life. It is from this concept that a believer derives his code of living and his attitude towards God, himself, the rest of mankind, living creatures and the universe. It is this concept that shapes a believer's conscience, feelings, personality, values and standards.