Hazrat Shaikh Moulana Muhammad Zakariyya (rahmatullahi ‘alaih) once mentioned the following:
It is mentioned in the hadeeth that when no person will remain in the world to take the name of Allah Ta‘ala, then at that time, Qiyaamah will take place. It is this very aspect of zikrullah (remembering Allah Ta‘ala and taking His name) that will cause the madrasahs (and other Deeni efforts) to continue.
Despite how unmindful one may be while making zikrullah (taking the name of Allah Ta‘ala), the name of Allah Ta‘ala will not go without having its effect. Unfortunately, we no longer have ikhlaas (sincerity) in our actions. So let us increase making zikr and remembering Allah Ta‘ala.
In a place where zikrullah is made in abundance, fitnahs will not be seen in such a place. The zikr of Allah Ta‘ala is the most effective barrier to protect and safeguard oneself from fitnahs and trials.
(Qutbul Aqtaab Hazrat Shaikhul Hadith Moulana Muhammad Zakariyya [rahmatullahi ‘alaih] pg. 559)