created everything for a purpose

هُوَ ٱلَّذِى جَعَلَ ٱلشَّمْسَ ضِيَآءً وَٱلْقَمَرَ نُورًا وَقَدَّرَهُۥ مَنَازِلَ لِتَعْلَمُوا۟ عَدَدَ ٱلسِّنِينَ وَٱلْحِسَابَ ۚ مَا خَلَقَ ٱللَّهُ ذَٰلِكَ إِلَّا بِٱلْحَقِّ ۚ يُفَصِّلُ ٱلْـَٔايَـٰتِ لِقَوْمٍ يَعْلَمُونَ

It is He who made the sun a shining radiance and the moon a light, determining phases for it so that you might know the number of years and how to calculate time. God did not create all these without a true purpose; He explains His signs to those who understand.

إِنَّ فِى ٱخْتِلَـٰفِ ٱلَّيْلِ وَٱلنَّهَارِ وَمَا خَلَقَ ٱللَّهُ فِى ٱلسَّمَـٰوَٰتِ وَٱلْأَرْضِ لَـَٔايَـٰتٍ لِّقَوْمٍ يَتَّقُونَ

In the succession of night and day, and in what God created in the heavens and earth, there truly are signs for those who are aware of Him.