(Al-Muaminoon) 23 : 30
إِنَّ فِي ذَٰلِكَ لَآيَاتٍ وَإِنْ كُنَّا لَمُبْتَلِينَ
Indeed in that are signs, and indeed, We are ever testing.
Lord has sent down mankind to earth to test him with whatever he has been provided as explained in verses 5: 48 and 6: 165. See explanation 2: 155-157.