These verses are a reminder of Allah's might and power. The very natural phenomenon that dictates a huge part of our human physiology (night and day-circadian rhythm). Our power is in submitting to his power. Control is an illusion. The night and day doesn't necessarily, according to some scholars, refer to just times of the day but also to stages of our spirituality and times of hardship and ease. The 'will you not listen' and 'will you not see...