“But they forgot Allah, so they forgot themselves.”
There is so much to be said about this one sentence, subhanallah. When you neglect Allah, when you choose other things to be as more important for you than Allah, then Allah makes you forget who you are. He makes you forget your identity.
And when this happens, your heart becomes hard. It feels empty. So you try to fill that emptiness with worldly things. You try to fill that hole in your heart not realising that the only thing that can bring you happiness is Allah.
Wallahi happiness can only be found with worshipping Allah. It can only be found in pleasing Him. When you make Him your priority, He will fill your heart with the sweetness of Iman.
And there is nothing more beautiful than the feeling of being close to Allah.
May Allah protect us from making this dunya our only concern.