"Indeed in that is a reminder for those of understanding," meaning the intellects. They are the believers, who take heed and thus know that what is in the world is fleeting.
Interpretation of Surah Az-Zumar from verse 22 to verse 26.
﴿إِنَّ فِي ذَلِكَ لَذِكْرَى لأُولِي الْأَلْبَاب﴾ الْعُقُول؛ وهم الْمُؤْمِنُونَ يتذكرون فيعلمون أنّ مَا فِي الدُّنْيَا ذاهبٌ.
تَفْسِير سُورَة الزمر من الْآيَة ٢٢ إِلَى آيَة ٢٦.