23لِكَيلا تَأسَوا عَلىٰ ما فاتَكُم وَلا تَفرَحوا بِما آتاكُم ۗ وَاللَّهُ لا يُحِبُّ كُلَّ مُختالٍ فَخورٍMuhammad Asad[Know this,] so that you may not despair over whatever [good] has escaped you nor exult [unduly] over whatever [good] has come to you:1 for, God does not love any of those who, out of self-conceit, act in a boastful manner2 -Thus, the knowledge that whatever has happened had to happen - and could not have not happened - because, obviously, it had been willed by God in accordance with His unfathomable plan, ought to enable a true believer to react with conscious equanimity to whatever good or ill conies to him.I.e., attributing their good fortune to their own merit or "luck".