(Qaaf) 50 : 37
إِنَّ فِي ذَٰلِكَ لَذِكْرَىٰ لِمَنْ كَانَ لَهُ قَلْبٌ أَوْ أَلْقَى السَّمْعَ وَهُوَ شَهِيدٌ

Indeed, in it surely there is a Reminder for the one who has the heart, or who gives hearing and he is a witness.

For those who are travelling through the residences of the people who were destroyed before and the remaining seen there, they have enough evidences for conceiving moral lessons by utilising their intelligences, and to see and witness whatever narrations they heard from others are true. But only one in a thousand believer who will return to the Paradise tries to understand Adhikr by utilising their faculties of hearing, sights and intelligence. And they only utilise Adhikr as the Criterion, Balance, Shield, Safeguard, Mercy and the Ticket to the Paradise, and also propagate It among the entire mankind to utilise for these purposes. See explanation 17: 36; 22: 45-46; and 32: 26-27.