أَلَمْ يَرَوْا أَنَّا جَعَلْنَا اللَّيْلَ لِيَسْكُنُوا فِيهِSee they not that We have made the night for them to rest therein,Due to the darkness of the night they halt their activities and calm themselves down, to recover from the exhausting efforts of the day.وَالنَّهَارَ مُبْصِرًاand the day sight-giving,meaning filled with light, so that they can work and earn a living, and travel and engage in business, and do other things that they need to do.إِنَّ فِي ذَلِكَ لَايَاتٍ لِّقَوْمٍ يُوْمِنُونَVerily, in this are Ayat for the people who believe